Lunar function allocation¶
Summary. The lunar objective decomposition spreadsheet (December 2025) allocates each lunar function to the assets that perform it: elements such as the Human Landing System, plus "Equipment", "Science/Research Payloads", "Tech Demos" and a column "Unallocated". Both allocation sheets are headed "FORWARD WORK". What the label covers, the whole allocation or only some columns, can't be recovered from the extracted text, so read the allocation with it in mind (open question 42). In the "FE+" sheet, 76 of the 208 lunar functions are marked Unallocated. They include every ISRU function, almost all propellant storage and transfer, power away from the South Pole, the cryogenic-sample chain, and month-plus habitation. Nine of the Moon Base Users Guide's 31 Phase 1 functional gaps are among them.
ADD Rev C prints its own version in Appendix B. B.3 maps functions to elements (pp. 148–165), B.4 to equipment (p. 166), and B.5 lists "Unallocated Functions by Use Case" (pp. 167–184). The ADD and the sheet agree closely (below). For Foundational Exploration, B.5 lists 75 of the sheet's 76 unallocated functions. It leaves out FN-M-402 L and adds two functions that B.3 itself maps to elements. B.3 leaves out six of the sheet's element allocations. Four of the 208 functions appear in none of the ADD's Foundational Exploration tables. By the ADD's B.5, 11 of the 31 Phase 1 functional gaps are unallocated.
NASA's 2024 mapping tables hold an earlier allocation, compared below. In 2024, 81 functions were Unallocated for FE. Six of them were allocated by 2025, five at least partly to the new Lunar Utility Rover or Communication/PNT Asset. One, FN-M-402 L, went the other way, from CLPS to Unallocated. Some of the ADD's differences from the 2025 sheet match the 2024 table, and others don't.
The functions themselves are listed on Lunar functions, and the objectives and use cases above them on Lunar objectives. The spreadsheet is described on its source page.
How this page is built¶
- Source. The sheets "FE+ Asset to Function Table" and "FE+ Functional Allocation", and their HLR counterparts, in the lunar decomposition spreadsheet; row = the asset or function ID. The asset tables and the X marks in the matrices agree wherever the wiki checked them, including the full Unallocated list (76 in both).
- "FORWARD WORK". The first row of both matrices reads "FORWARD WORK", and both asset tables give "Science/Research Payloads" and "Tech Demos" as "FORWARD WORK" with no functions. What the label covers isn't recorded in the extracted text (source page).
- Function titles are on Lunar functions. The sheet's titles are the ADD's, apart from print differences.
-
Compared with the ADD. ADD Appendix B.3 (element function mappings, pp. 148–165), B.4 (equipment, p. 166) and B.5 ("Unallocated Functions by Use Case", pp. 167–184; p. 185 is blank) were read in full and checked against the sheet:
- Function by function, for every element and segment
- Pair by pair, for B.5: each use case–function pair against "FE+ Functions to Use Cases" and the sheet's Unallocated column
The rendered PDF was checked where the text layer is scrambled or odd (pp. 158, 166, 169, 175, 176). The counts are the wiki's (below). Each element's own B.3 list is on its element page.
-
"HLR" and "FE+" are the sheet's labels; "FE+" is not defined (source page). The 2024 table labels the same columns "HLR" and "FE".
- The 2024 allocation was compared asset by asset with the 2025 sheet, for FE and HLR, and function by function for the Unallocated columns (2024 lunar table).
The assets¶
The FE+ sheet has 18 named assets and four other columns. The link to a wiki element page is the wiki's match, by name; where the names differ, the column says so.
| Asset (as in the sheet) | Wiki page | Functions, HLR | Functions, FE+ |
|---|---|---|---|
| Space Launch System | SLS | 6 | 6 |
| Exploration Ground Systems | EGS | 7 | 9 |
| Orion | Orion | 13 | 14 |
| Gateway (HLR); Gateway Expanded Capability (FE+) | Gateway | 14 | 23 |
| Human Landing System | HLS | 20 | 29 |
| Lunar Communications Relay and Navigation System | SCaN Networks (the ADD's LCRNS project; the ADD writes "Systems") | 5 | 5 |
| xEVA System | xEVA | 5 | 9 |
| CLPS Provider Landers | CLPS | 3 | 6 |
| Gateway Logistics Element | Gateway | 7 | 7 |
| NSN/DSN | SCaN Networks | 5 | 10 |
| Human-Class Delivery System | Human-Class Delivery Lander (name differs) | 5 | |
| Lunar Terrain Vehicle | LTV | 19 | |
| Pressurized Rover | Pressurized Rover | 21 | |
| Initial Surface Habitation | Initial Surface Habitat (name differs) | 24 | |
| Lunar Surface Cargo Lander | Lunar Surface Cargo Lander | 4 | |
| Lunar Utility Rover | Lunar Utility Rover | 6 | |
| Lunar Nuclear Fission System | Lunar Nuclear Fission System | 3 | |
| Communication/PNT Asset | none: a generic asset, not an ADD element | 8 | |
| Equipment | Utilization payloads and equipment | 1 | 8 |
| Science/Research Payloads | same | "FORWARD WORK" | "FORWARD WORK" |
| Tech Demos | same | "FORWARD WORK" | "FORWARD WORK" |
| Unallocated | 1 (FN-C-205 L) | 76 |
Counts are rows in the asset tables; a function can sit under several assets. All 15 ADD elements have a column in FE+ (the wiki's matching). HLR has the first ten assets, Equipment, and the three other columns.
FE+ allocation by asset¶
Function IDs as listed in "FE+ Asset to Function Table".
| Asset | Functions |
|---|---|
| Space Launch System | FN-T-101 L, FN-T-112 L, FN-T-216 L, FN-G-102 L, FN-G-104 L, FN-G-105 L |
| Exploration Ground Systems | FN-G-101 L to FN-G-107 L, FN-G-201 L, FN-G-202 L |
| Orion | FN-T-101 L, FN-T-105 L, FN-T-106 L, FN-T-107 L, FN-T-111 L, FN-T-112 L, FN-T-211 L, FN-T-217 L, FN-T-307 L, FN-T-308 L, FN-H-103 L, FN-L-202 L, FN-L-302 L, FN-U-206 L |
| Gateway Expanded Capability | FN-T-106 L, FN-H-103 L, FN-H-202 L, FN-X-102 L, FN-L-202 L, FN-L-302 L, FN-P-303 L, FN-M-301 L, FN-C-101 L, FN-C-102 L, FN-C-105 L, FN-C-106 L, FN-C-108 L, FN-D-102 L, FN-D-106 L, FN-D-202 L, FN-A-106 L, FN-A-203 L, FN-A-204 L, FN-A-404 L, FN-U-202 L, FN-U-205 L, FN-U-508 L |
| Human Landing System | FN-T-102 L, FN-T-103 L, FN-T-104 L, FN-T-106 L, FN-T-108 L, FN-T-109 L, FN-T-110 L, FN-T-201 L, FN-T-203 L, FN-T-209 L, FN-T-210 L, FN-T-304 L, FN-T-305 L, FN-T-401 L, FN-T-403 L, FN-H-103 L, FN-L-202 L, FN-L-302 L, FN-P-305 L, FN-M-202 L, FN-M-203 L, FN-M-401 L, FN-D-101 L, FN-D-102 L, FN-D-105 L, FN-U-102 L, FN-U-405 L, FN-U-414 L, FN-U-415 L |
| Lunar Communications Relay and Navigation System | FN-C-101 L, FN-C-105 L, FN-C-106 L, FN-C-201 L, FN-C-204 L |
| xEVA System | FN-M-101 L, FN-M-102 L, FN-M-104 L, FN-M-201 L, FN-U-102 L, FN-U-301 L to FN-U-304 L |
| CLPS Provider Landers | FN-T-201 L, FN-T-203 L, FN-T-205 L, FN-T-402 L, FN-T-403 L, FN-M-401 L |
| Gateway Logistics Element | FN-T-106 L, FN-T-213 L, FN-T-214 L, FN-L-202 L, FN-L-204 L, FN-L-206 L, FN-L-302 L |
| NSN/DSN | FN-C-101 L, FN-C-102 L, FN-C-104 L, FN-C-105 L, FN-C-106 L, FN-C-204 L, FN-A-201 L, FN-A-202 L, FN-A-401 L, FN-A-402 L |
| Human-Class Delivery System | FN-T-206 L, FN-T-402 L, FN-T-403 L, FN-P-305 L, FN-M-403 L |
| Lunar Terrain Vehicle | FN-P-305 L, FN-M-302 L, FN-M-304 L, FN-M-501 L, FN-M-504 L, FN-M-506 L, FN-M-508 L, FN-M-601 L, FN-M-701 L, FN-C-103 L, FN-D-101 L, FN-A-103 L, FN-A-104 L, FN-A-302 L, FN-A-403 L, FN-U-102 L, FN-U-401 L, FN-U-411 L, FN-U-412 L |
| Pressurized Rover | FN-H-101 L, FN-H-201 L, FN-X-101 L, FN-L-201 L, FN-P-305 L, FN-M-202 L, FN-M-203 L, FN-M-305 L, FN-M-505 L, FN-M-507 L, FN-M-509 L, FN-M-510 L, FN-M-601 L, FN-M-701 L, FN-C-103 L, FN-D-101 L, FN-D-105 L, FN-A-103 L, FN-A-403 L, FN-U-102 L, FN-U-401 L |
| Initial Surface Habitation | FN-H-101 L, FN-H-201 L, FN-X-101 L, FN-L-101 L, FN-L-201 L, FN-P-305 L, FN-P-401 L, FN-P-402 L, FN-M-202 L, FN-M-203 L, FN-C-101 L, FN-C-103 L, FN-C-105 L, FN-C-107 L, FN-C-108 L, FN-D-101 L, FN-D-105 L, FN-D-201 L, FN-A-403 L, FN-U-203 L, FN-U-204 L, FN-U-401 L, FN-U-414 L, FN-U-415 L |
| Lunar Surface Cargo Lander | FN-T-202 L, FN-T-204 L, FN-T-402 L, FN-T-403 L |
| Lunar Utility Rover | FN-M-501 L, FN-M-503 L, FN-M-701 L, FN-A-104 L, FN-A-105 L, FN-A-302 L |
| Lunar Nuclear Fission System | FN-P-101 L, FN-P-301 L, FN-P-401 L |
| Communication/PNT Asset | FN-C-101 L, FN-C-103 L, FN-C-105 L, FN-C-107 L, FN-C-108 L, FN-C-205 L, FN-D-101 L, FN-D-201 L |
| Equipment | FN-U-303 L, FN-U-304 L, FN-U-402 L, FN-U-403 L, FN-U-405 L, FN-U-406 L, FN-U-408 L, FN-U-409 L |
Things the table shows (read off the sheet):
- FN-P-305 L, "Provide bi-directional power exchange capability", is on five assets: HLS, the Human-Class Delivery System, the LTV, the Pressurized Rover and Initial Surface Habitation.
- Surface communications. FN-C-103 L (between assets on the surface) is on the LTV, the Pressurized Rover, Initial Surface Habitation and the Communication/PNT Asset. The lunar time scale, FN-C-205 L, is on the Communication/PNT Asset only.
- Precision landing for cargo, FN-T-402 L, is on CLPS, the Human-Class Delivery System and the Lunar Surface Cargo Lander. Landing "under all lighting conditions", FN-T-403 L, is on those three and HLS.
The 76 unallocated functions (FE+)¶
Every function with an X in the "Unallocated" column, which is the same as the "Unallocated" block of the asset table. Two are also marked against an element (*). Titles are the ADD's (Lunar functions).
| Letter | ID | Function |
|---|---|---|
| T | FN-T-207 L | Transport a small amount of cargo (10s of kg) from the lunar surface to Earth |
| T | FN-T-208 L | Transport a large amount of cargo (100s of kg) from the lunar surface to Earth |
| T | FN-T-212 L | Transport a large amount of cargo (100s of kg) from cislunar space to Earth |
| T | FN-T-215 L | Transport cargo from Earth to assets in deep space |
| T | FN-T-301 L | Provide resources to condition refrigerated sample containers during transit from the lunar surface to Earth |
| T | FN-T-302 L | Provide resources to condition frozen sample containers during transit from the lunar surface to Earth |
| T | FN-T-303 L | Provide resources to condition cryogenic sample containers during transit from the lunar surface to Earth |
| T | FN-T-306 L | Provide resources to condition cryogenic sample containers during transit from the lunar surface to cislunar space |
| T | FN-T-309 L | Provide resources to condition cryogenic sample containers during transit from cislunar space to Earth |
| H | FN-H-102 L | Enable a pressurized, habitable environment on the lunar surface for mid-duration (month+) use |
| H | FN-H-104 L | Enable a pressurized, habitable environment in cislunar space for mid-durations (month+) |
| H | FN-H-105 L | Enable a pressurized, habitable environment in cislunar space for long-durations (year+) |
| X | FN-X-103 L | Provide crew countermeasure system(s) to support the crew for mid-durations (month+) on the lunar surface |
| X | FN-X-104 L | Provide crew countermeasure system(s) to support the crew for mid-(month+) to long-durations (year+) in cislunar space |
| X | FN-X-201 L | Provide in-mission crew training on the lunar surface |
| X | FN-X-202 L | Provide in-mission crew training in cislunar space |
| L | FN-L-203 L | Transfer water to habitable assets on the lunar surface |
| L | FN-L-205 L | Transfer gases to habitable assets on the lunar surface |
| L | FN-L-301 L | Manage waste from habitable asset(s) on the lunar surface |
| P | FN-P-101 L* | Generate power in the south pole region on the lunar surface (also Lunar Nuclear Fission System) |
| P | FN-P-102 L | Generate power at multiple distributed locations outside of the south pole region on the lunar surface |
| P | FN-P-201 L | Store energy at multiple distributed locations outside of the south pole region on the lunar surface |
| P | FN-P-202 L | Store energy in the south pole region on the lunar surface |
| P | FN-P-301 L* | Distribute power in the south pole region on the lunar surface (also Lunar Nuclear Fission System) |
| P | FN-P-302 L | Distribute power at multiple distributed locations outside of the south pole region on the lunar surface |
| P | FN-P-304 L | Distribute power to utilization payloads and/or equipment in deep space |
| M | FN-M-103 L | Enable crew lunar surface extravehicular activities at the lunar far side region |
| M | FN-M-303 L | Enable local unpressurized surface mobility in sunlit areas and non-PSRs at distributed sites on the lunar surface |
| M | FN-M-402 L | Unload a moderate amount of cargo (1000s of kg) on the lunar surface |
| M | FN-M-502 L | Reposition a limited amount of cargo (100s of kg) at distributed sites on the lunar surface |
| M | FN-M-602 L | Relocate exploration assets at distributed locations outside of the south pole region on the lunar surface |
| C | FN-C-202 L | Provide position, navigation, and timing services at distributed sites on the near side and outside of the south pole region on the lunar surface |
| C | FN-C-203 L | Provide position, navigation, and timing services at the far side and outside the south pole region on the lunar surface |
| D | FN-D-103 L | Collect, store, and locally distribute large volumes of data on the lunar surface sufficient to perform real time analysis for in situ decision making |
| D | FN-D-104 L | Collect, store, and locally distribute large volumes of data in cislunar space sufficient to perform real time analysis for in situ decision making |
| D | FN-D-203 L | Process large volumes of data locally on the lunar surface sufficient to perform real time analysis for in situ decision making |
| D | FN-D-204 L | Process large volumes of data locally in cislunar space sufficient to perform real time analysis for in situ decision making |
| A | FN-A-101 L | Provide robotic systems to assist crew in sunlit areas and non-PSRs on the lunar surface |
| A | FN-A-102 L | Provide robotic systems to assist crew in PSRs on the lunar surface |
| A | FN-A-301 L | Monitor robotic system(s) performance and health |
| I | FN-I-101 L | Collect water/ice from the south pole region of the lunar surface |
| I | FN-I-102 L | Produce scalable quantities of oxygen from lunar regolith |
| I | FN-I-103 L | Produce scalable quantities of water from in-situ materials on the lunar surface |
| I | FN-I-104 L | Conduct ISRU utilization payload and/or equipment operations on the lunar surface |
| I | FN-I-105 L | Store oxygen on the lunar surface |
| I | FN-I-106 L | Store collected water/ice on the lunar surface |
| I | FN-I-107 L | Transport scalable quantities of oxygen produced to exploration elements |
| I | FN-I-108 L | Transport scalable quantities of water produced to exploration elements |
| I | FN-I-201 L | Collect regolith at sub-scale to support demonstration using scalable capability |
| I | FN-I-202 L | Conduct regolith recovery demonstration utilization payload and/or equipment operations on the lunar surface |
| I | FN-I-203 L | Provide storage for collected regolith |
| I | FN-I-204 L | Process and refine scalable quantities of in-situ feedstock resources on the lunar surface |
| I | FN-I-205 L | Conduct autonomous construction utilization payload and/or equipment operations on the lunar surface |
| I | FN-I-206 L | Conduct advanced manufacturing utilization payload and/or equipment operations on the lunar surface |
| I | FN-I-207 L | Conduct regolith-based additive/subtractive manufacturing utilization payload and/or equipment operations on the lunar surface |
| U | FN-U-101 L | Observe and sense the lunar surface from lunar orbit |
| U | FN-U-103 L | Conduct resource identification utilization payload and/or equipment operations on the lunar surface |
| U | FN-U-201 L | Provide locations to host utilization payload(s) and/or equipment in deep space |
| U | FN-U-305 L | Provide capability to recover and package deep subsurface samples, including drill cores, maintaining scientific integrity of the samples, from non-PSRs and sunlit regions on the lunar surface |
| U | FN-U-306 L | Provide capability to recover and package deep subsurface samples, including drill cores, maintaining scientific integrity of the samples, from PSRs on the lunar surface |
| U | FN-U-404 L | Stow cryogenic samples during transport from the Lunar Surface to Earth, while maintaining scientific integrity of samples |
| U | FN-U-407 L | Stow cryogenic samples during transport from the Lunar Surface to cislunar space, while maintaining scientific integrity of samples |
| U | FN-U-410 L | Stow cryogenic samples during transport from cislunar space to Earth, while maintaining scientific integrity of samples |
| U | FN-U-413 L | Stow collected cryogenic samples on exploration assets while on the lunar surface, while maintaining scientific integrity of the samples |
| U | FN-U-416 L | Provide resources to condition cryogenic sample containers on the lunar surface |
| U | FN-U-501 L | Provide capability to access residual propellant from surface assets |
| U | FN-U-502 L | Transfer propellant between assets on the lunar surface |
| U | FN-U-503 L | Provide storage of cryogenic propellant on the lunar surface |
| U | FN-U-504 L | Provide storage of cryogenic propellant in space |
| U | FN-U-505 L | Provide storage of non-cryogenic propellant in space |
| U | FN-U-506 L | Provide storage of non-cryogenic propellant on the lunar surface |
| U | FN-U-507 L | Conduct fluid and propellant transfer utilization payload and/or equipment operations on the lunar surface |
| U | FN-U-509 L | Provide propellant management system(s) in partial gravity environment |
| U | FN-U-510 L | Provide propellant management system(s) in microgravity environment |
| U | FN-U-601 L | Conduct bioregenerative ECLSS utilization payload and/or equipment operations in space |
| U | FN-U-602 L | Conduct plant growth utilization payload and/or equipment operations in space |
By letter: T 9, H 3, X 4, L 3, P 7, M 5, C 2, D 4, A 3, I 15, U 21. No G function is unallocated.
In the ADD. ADD Appendix B.5 lists 75 of the 76 as unallocated, under the use cases the sheet pairs them with. The exception is FN-M-402 L, which no ADD table for Foundational Exploration names. B.5 also lists FN-A-103 L and FN-A-105 L, which the sheet allocates (B.5 against the sheet).
What they have in common. The groups are the wiki's, made from the list above:
- ISRU: all 15 I functions.
- Propellant: every FN-U-5xx L storage, transfer and management function except FN-U-508 L (transfer in space), which is on Gateway Expanded Capability.
- Power.
- Unallocated: generation, storage and distribution at distributed sites; energy storage at the South Pole; payload power in deep space.
- South Pole generation and distribution (FN-P-101 L, FN-P-301 L) are on the fission system and also marked Unallocated.
- Allocated: surface payload power (FN-P-401 L, FN-P-402 L), cislunar payload power (FN-P-303 L) and bi-directional power exchange (FN-P-305 L).
- Cryogenic samples: all eight cryogenic conditioning and stowage functions. Repositioning cryogenic samples on the surface, FN-M-510 L, is on the Pressurized Rover.
- Samples and cargo back to Earth.
- Unallocated: return from the surface to Earth, small and large (FN-T-207 L, FN-T-208 L); large return from cislunar space (FN-T-212 L); refrigerated and frozen conditioning on the way from the surface to Earth (FN-T-301 L, FN-T-302 L).
- Allocated: small return from cislunar space (FN-T-211 L) and the cislunar-to-Earth conditioning legs (FN-T-307 L, FN-T-308 L) are on Orion. The surface-to-cislunar legs (FN-T-304 L, FN-T-305 L) are on HLS.
- Month-plus stays and crew support: mid- and long-duration habitation, crew countermeasures, and in-mission training.
- Surface logistics: water and gas transfer and waste management on the surface, and unloading 1000s of kg (FN-M-402 L).
- Away from the South Pole:
- far-side EVA
- PNT at distributed and far-side sites
- at distributed sites: mobility, cargo repositioning and asset relocation
- Deep space: cargo delivery, payload power and payload hosting (FN-T-215 L, FN-P-304 L, FN-U-201 L).
- Large-volume data for real-time analysis, on the surface and in cislunar space.
- Robots assisting crew (FN-A-101 L, FN-A-102 L) and robot health monitoring (FN-A-301 L).
- Science and resource operations:
- orbital observation (FN-U-101 L)
- resource identification (FN-U-103 L)
- deep drill cores (FN-U-305 L, FN-U-306 L)
- bioregenerative ECLSS and plant growth (FN-U-601 L, FN-U-602 L)
The ADD's own mapping: Appendix B.3 to B.5¶
ADD Rev C's Appendix B ends with three sections that cover the same ground as the sheet's allocation. All three are lunar, for Human Lunar Return (HLR) and Foundational Exploration (FE). There is nothing for Sustained Lunar Evolution, and nothing for Mars.
What the ADD says about them:
- B.3, "Element Function Mappings" (pp. 148–165). One table per element and segment, in
alphabetical order from B.3.1 Commercial Lunar Payload Services to B.3.15 Space Launch System. Two
notes open it (p. 148):
- "Human Lunar Return segment elements form the basis for satisfying functional needs. These element mappings help identify functional gaps that must be addressed in follow-on segments."
- "This document does not map some supporting capabilities as elements. For example, while commercial launch vehicles will play a vital role in the architecture, they are not mapped here, as they are subject to future implementations and procurements."
- B.4, "Utilization Payloads and Equipment Function Mappings" (p. 166). One "Equipment" table per segment. Its notes: "Science/research payloads and technology demonstrations are forward work", and "Utilization payloads function mappings are forward work and will appear in subsequent revisions" (p. 166). This matches the sheet's "FORWARD WORK" for "Science/Research Payloads" and "Tech Demos". It doesn't settle what the label at the top of the sheet's matrices covers (open question 42).
- B.5, "Unallocated Functions by Use Case" (pp. 167–184). One table per use case, giving the use case and the functions under it that no element performs. HLR has four tables (B.5.1) and FE 75 (B.5.2), grouped by sub-architecture. B.5.1 ends: "All the use cases listed above share a single unallocated function for the Human Lunar Return segment, FN-C-205 L: 'Provide a coordinated lunar time scale.'" (p. 167). B.5 says nothing else about how it was made. p. 185 is blank.
B.3 and B.4 against the sheet, element by element¶
Counts are functions in each table (the wiki's count); "sheet" is the HLR or FE+ asset table. The pages are B.3's.
| ADD table (pages) | Sheet asset | HLR: ADD / sheet | FE: ADD / sheet FE+ | Differences |
|---|---|---|---|---|
| CLPS (p. 148) | CLPS Provider Landers | 3 / 3 | 5 / 6 | FE: the sheet adds FN-T-402 L, precision landing for cargo |
| Exploration EVA Systems (p. 149) | xEVA System | 5 / 5 | 9 / 9 | none |
| Exploration Ground Systems (p. 150) | Exploration Ground Systems | 7 / 7 | 7 / 9 | FE: the sheet adds FN-G-106 L and FN-G-107 L, ground services and launch "to support large nuclear assets" |
| Gateway: Crew-Capable (HLR) and Expanded Capability (FE) Configurations (pp. 151–153) | Gateway; Gateway Expanded Capability | 16 / 14 | 23 / 23 | HLR: the ADD adds FN-D-102 L and FN-P-303 L. Neither is among the sheet's 58 HLR functions. |
| Gateway Logistics Element (pp. 151–153) | Gateway Logistics Element | 7 / 7 | 7 / 7 | none |
| Human Landing System (pp. 154–156) | Human Landing System | 21 / 20 | 28 / 29 | HLR: the ADD adds FN-U-414 L, which isn't among the sheet's HLR functions. FE: the sheet adds FN-U-414 L. |
| Human-Class Delivery Lander (p. 156) | Human-Class Delivery System | 5 / 5 | none | |
| Initial Surface Habitat (pp. 157–158) | Initial Surface Habitation | 23 / 24 | FE: the sheet adds FN-D-101 L, surface data | |
| Lunar Nuclear Fission System (p. 158) | same | 3 / 3 | none | |
| Lunar Surface Cargo Lander (p. 158) | same | 4 / 4 | none. The ADD's table is headed "Human-Class Delivery Lander" (PDF checked). | |
| Lunar Terrain Vehicle (p. 159) | same | 18 / 19 | FE: the sheet adds FN-A-103 L, reconnaissance | |
| Lunar Utility Rover (p. 160) | same | 6 / 6 | none | |
| Orion Spacecraft (pp. 160–161) | Orion | 13 / 13 | 14 / 14 | none |
| Pressurized Rover (pp. 162–163) | same | 21 / 21 | none | |
| SCaN Networks: Near Space Network and Deep Space Network (pp. 163–164) | NSN/DSN | 5 / 5 | 10 / 10 | none |
| SCaN Networks: Lunar Communications Relay and Navigation Systems (pp. 163–164) | Lunar Communications Relay and Navigation System | 5 / 5 | 5 / 5 | none |
| Space Launch System (p. 165) | Space Launch System | 6 / 6 | 6 / 6 | none |
| none | Communication/PNT Asset | none / 8 | No ADD table. Seven of its eight functions are on ADD elements; the eighth is FN-C-205 L (below). | |
| B.4 Equipment (p. 166) | Equipment | 1 / 1 | 8 / 8 | none |
What the table shows:
- FE. Every element–function pair B.3 prints is in the sheet's FE+ table: 194 pairs, plus 8 for Equipment. The sheet has six more element pairs and the Communication/PNT Asset's eight. In no FE case does the ADD map a function to an element that the sheet doesn't.
- HLR. Every pair in the sheet's HLR table is in B.3. B.3 has three more, and all three are functions missing from the sheet's 58-function HLR list: Gateway FN-D-102 L and FN-P-303 L, HLS FN-U-414 L. In FE, both sources put FN-D-102 L on HLS and Gateway, FN-P-303 L on Gateway, and FN-U-414 L on Initial Surface Habitation (the sheet adds HLS).
- FN-M-504 L, the HLR row with no mark in the sheet, has no HLR element in the ADD either, and isn't in B.5.1. In FE both give it to the LTV.
- Names. The B.3 headings use the ADD's element names. The sheet's differ (for example "Human-Class Delivery System", "Initial Surface Habitation"); the matches are as in the assets. B.3.2 is headed "Exploration EVA Systems", the one-pager "Exploration EVA System" (p. 48). B.3.14 writes "Lunar Communications Relay and Navigation Systems", the sheet "System".
B.5 against the sheet's Unallocated functions¶
HLR. B.5.1 has four use cases, UC-C-202 L, UC-C-203 L, UC-U-103 L and UC-U-301 L, each with FN-C-205 L only (p. 167). These are the four use cases the sheet's "HLR Functions to Use Cases" pairs with FN-C-205 L, its one HLR Unallocated function. They match exactly.
FE. B.5.2 has 75 use cases and 137 use case–function pairs, naming 77 functions (the wiki's count). Against the sheet:
| Sheet (FE+) | ADD B.5.2 | |
|---|---|---|
| Functions | 76 marked Unallocated | 77 |
| Use cases with one of them | 77 | 75 |
| Use case–function pairs | 150 | 137 |
| In both | 75 functions, 73 use cases, 133 pairs |
- 133 of B.5.2's 137 pairs are pairs the sheet makes between a use case and one of its Unallocated functions.
-
The other four name FN-A-103 L or FN-A-105 L. The sheet makes these pairs too, but it allocates both functions to elements:
- FN-A-103 L, "Provide a robotic system capable of conducting reconnaissance", under UC-U-102 L, UC-U-105 L and UC-U-106 L. The sheet has it on the LTV and the Pressurized Rover. B.3 maps it to the Pressurized Rover (p. 162) but not the LTV.
- FN-A-105 L, "Interface robotic system(s) with logistics carriers on the lunar surface", under UC-A-103 L. The sheet and B.3 (p. 160) give it to the Lunar Utility Rover.
These are the only use cases each function serves in the sheet, so B.5 lists every use of both as unallocated. Inside the ADD, B.3 maps the two functions and B.5 lists them as unallocated. The ADD doesn't explain it (open question 64).
-
The sheet's other 17 pairs are all FN-M-402 L, "Unload a moderate amount of cargo (1000s of kg) on the lunar surface". The sheet marks it Unallocated and puts it under 17 use cases: UC-L-201 L, UC-M-402 L, UC-I-101 L, UC-I-102 L, UC-I-103 L, UC-I-106 L, UC-I-201 L, UC-I-202 L, UC-U-204 L, UC-U-504 L and UC-U-701 L to UC-U-705 L, UC-U-717 L, UC-U-718 L. B.5 lists it under none of them. Four of those use cases (UC-M-402 L, UC-U-204 L, UC-U-703 L, UC-U-705 L) have no other unallocated function, so they aren't in B.5 at all.
- FN-P-101 L and FN-P-301 L are marked both ways in both sources. B.3.8 maps them to the fission system (p. 158), and B.5 lists them under UC-P-101 L, UC-P-301 L and UC-U-201 L (pp. 174, 178). The sheet does the same.
Functions in none of the ADD's FE tables¶
B.3 (FE), B.4.2 and B.5.2 together name 204 of the 208 lunar functions (the wiki's count, by letter). The other four are in the ADD's list of lunar functions (B.2.2) and nowhere else in Appendix B for Foundational Exploration (text layer searched):
| Function | Title (ADD B.2.2) | In the sheet (FE+) | Elsewhere in the ADD |
|---|---|---|---|
| FN-G-106 L | Provide ground services on Earth to support large nuclear assets | Exploration Ground Systems | |
| FN-G-107 L | Enable vehicle launch(es) to support large nuclear assets | Exploration Ground Systems | |
| FN-C-205 L | Provide a coordinated lunar time scale | Communication/PNT Asset | B.5.1: unallocated in HLR (p. 167) |
| FN-M-402 L | Unload a moderate amount of cargo (1000s of kg) on the lunar surface | Unallocated (17 use cases) |
So in the ADD's FE tables these four are neither mapped to an element nor listed as unallocated. The sheet places each one. The ADD doesn't say why (open question 64).
B.5 by use case¶
The ADD's B.5 in full: each use case and the functions it lists as unallocated, in the ADD's order. Titles are the ADD's. Long recurring openings are cut and marked "…":
- "Deployment and operation of utilization payload(s) and/or equipment related to"
- "Deployment and operation of exploration assets, including utilization payload(s) and/or equipment, related to"
- "maintaining scientific integrity of the samples"
Full titles are on Lunar use cases, and function titles on Lunar functions. Marks:
- †B.3 maps the function to an element, and the sheet allocates it
- ‡ B.3 maps the function to an element, and both sources also list it as unallocated
- MB the function is a Moon Base Phase 1 functional gap (the wiki's join)
| Section (page) | Use case | Title | Unallocated functions |
|---|---|---|---|
| B.5.1.1 C&PNT, HLR (p. 167) | UC-C-202 L | Determination of position, navigation, and timing by crew and assets at the south pole region on the lunar surface | FN-C-205 L |
| B.5.1.1 C&PNT, HLR (p. 167) | UC-C-203 L | Crew or robotics utilization of position, navigation, and timing for accurate sample tracking at the south pole region on the lunar surface | FN-C-205 L |
| B.5.1.2 Utilization, HLR (p. 167) | UC-U-103 L | Crew identification of surface samples in sunlit areas and non-PSRs in the south pole region on the lunar surface | FN-C-205 L |
| B.5.1.2 Utilization, HLR (p. 167) | UC-U-301 L | Collection, documentation, and packaging of surface and/or shallow subsurface samples, … from non-PSRs and sunlit areas in the south pole region on the lunar surface | FN-C-205 L |
| B.5.2.1 Robotics (p. 168) | UC-A-101 L | Robotic assistance of crew exploration, site surveying, sample and resource locating, documentation, and sample retrieval from PSRs | FN-A-102 L |
| B.5.2.1 Robotics (p. 168) | UC-A-103 L | Robotic support of logistic operations on the lunar surface as necessary | FN-A-105 L †MB |
| B.5.2.1 Robotics (p. 168) | UC-A-104 L | Robotic assistance of crew exploration, site surveying, sample and resource locating, documentation, and sample retrieval from sunlit areas and non-PSRs | FN-A-101 L |
| B.5.2.1 Robotics (p. 168) | UC-A-201 L | Remote management of robotic system(s) during surface operation as necessary | FN-A-301 L |
| B.5.2.1 Robotics (p. 168) | UC-A-202 L | Remote management of robotic system(s) during in space operation as necessary | FN-A-301 L |
| B.5.2.2 C&PNT (p. 169) | UC-C-204 L, printed "UC-A-204 L" | Determination of position, navigation, and timing by crew and assets at distributed sites on the lunar surface | FN-C-202 L |
| B.5.2.2 C&PNT (p. 169) | UC-C-205 L, printed "UC-A-205 L" | Crew or robotics utilization of position, navigation, and timing for accurate sample tracking at distributed sites on the lunar surface | FN-C-202 L |
| B.5.2.2 C&PNT (p. 169) | UC-C-206 L, printed "UC-A-206 L" | Determination of position, navigation, and timing by crew and assets at the far side of the lunar surface | FN-C-203 L |
| B.5.2.2 C&PNT (p. 169) | UC-C-207 L, printed "UC-A-207 L" | Crew or robotics utilization of position, navigation, and timing for accurate sample tracking at the far side on the lunar surface | FN-C-203 L |
| B.5.2.3 Data (p. 169) | UC-D-201 L | Storage and local processing of space weather data | FN-D-103 L, FN-D-104 L, FN-D-203 L, FN-D-204 L |
| B.5.2.4 Habitation (p. 170) | UC-H-101 L | Crew habitation of assets on the lunar surface for short-durations (days to weeks) | FN-L-301 L MB |
| B.5.2.4 Habitation (p. 170) | UC-H-102 L | Crew habitation of assets on the lunar surface for mid-durations (month+) | FN-H-102 L MB, FN-L-301 L MB |
| B.5.2.4 Habitation (p. 170) | UC-H-103 L | Crew habitation of assets for mid-duration (month+) mission(s) in cislunar space | FN-H-104 L |
| B.5.2.4 Habitation (p. 170) | UC-H-104 L | Crew habitation of assets for long-duration (year+) mission(s) in cislunar space | FN-H-105 L |
| B.5.2.5 ISRU (p. 170) | UC-I-101 L | … demonstration of ISRU on the lunar surface with long-term remote operation | FN-I-104 L, FN-U-103 L MB |
| B.5.2.5 ISRU (p. 171) | UC-I-102 L | … demonstration of oxygen recovery from lunar regolith | FN-I-102 L, FN-I-105 L, FN-I-107 L, FN-I-201 L, FN-I-203 L, FN-U-103 L MB |
| B.5.2.5 ISRU (p. 171) | UC-I-103 L | … demonstration of water recovery from the lunar regolith in the polar regions | FN-I-101 L, FN-I-103 L, FN-I-106 L, FN-I-108 L, FN-U-103 L MB |
| B.5.2.5 ISRU (p. 171) | UC-I-104 L | … demonstration of water transfer from ISRU production assets to other exploration assets | FN-L-203 L MB |
| B.5.2.5 ISRU (p. 171) | UC-I-105 L | … demonstration of gas transfer from ISRU production assets to other exploration assets | FN-L-205 L MB |
| B.5.2.5 ISRU (p. 172) | UC-I-106 L | … demonstration of operational techniques to recover and refine metals from the lunar regolith | FN-I-201 L, FN-I-202 L, FN-I-204 L, FN-U-103 L MB |
| B.5.2.5 ISRU (p. 172) | UC-I-201 L | … autonomous construction demonstration utilization payload(s) on the lunar surface with long-term remote operation | FN-I-204 L, FN-I-205 L |
| B.5.2.5 ISRU (p. 172) | UC-I-202 L | … demonstration of autonomous construction techniques, e.g., collection of regolith, processing regolith into feedstock, and regolith construction | FN-I-201 L, FN-I-204 L, FN-I-205 L |
| B.5.2.5 ISRU (p. 172) | UC-I-203 L | … demonstration of regolith based additive/subtractive manufacturing techniques | FN-I-201 L, FN-I-204 L, FN-I-207 L |
| B.5.2.5 ISRU (p. 173) | UC-I-204 L | … advanced manufacturing demonstration on the lunar surface with long-term remote operation | FN-I-206 L |
| B.5.2.6 Logistics (p. 173) | UC-L-201 L | Resupply of cargo and management of waste to/from habitable assets on the lunar surface | FN-L-203 L MB, FN-L-205 L MB, FN-L-301 L MB |
| B.5.2.7 Mobility (p. 173) | UC-M-103 L | Crew use of tools to assist in performing extravehicular activities, sample collection and suit cleaning | FN-U-305 L, FN-U-306 L |
| B.5.2.7 Mobility (p. 173) | UC-M-301 L | Conduct of crew excursions to locations in sunlit areas and non-PSRs at distributed locations outside of the south pole region around landing site | FN-C-202 L, FN-M-303 L |
| B.5.2.7 Mobility (p. 174) | UC-M-602 L | Demonstration of uncrewed relocation of exploration assets to sites at distributed locations outside of the south pole region on the lunar surface | FN-C-202 L, FN-M-602 L |
| B.5.2.8 Power (p. 174) | UC-P-101 L | Power generation and energy storage at south pole region on the lunar surface | FN-P-101 L ‡ MB, FN-P-202 L |
| B.5.2.8 Power (p. 174) | UC-P-102 L | Power generation and energy storage at multiple distributed locations outside of the south pole region on the lunar surface | FN-P-102 L MB, FN-P-201 L |
| B.5.2.8 Power (p. 174) | UC-P-301 L | Power distribution around power generation and energy storage system(s) in the south pole region on the lunar surface | FN-P-301 L ‡ MB |
| B.5.2.8 Power (p. 174) | UC-P-302 L | Power distribution from power generation and energy storage system(s) at multiple distributed locations outside of the south pole region on the lunar surface | FN-P-302 L |
| B.5.2.9 Transportation (p. 175) | UC-T-203 L | Transportation of cargo from cislunar space to Earth | FN-T-212 L |
| B.5.2.9 Transportation (p. 175) | UC-T-301 L | Return of a small amount of unconditioned samples and containers (10s of kg) from the lunar surface to Earth with the samples in sealed sample containers | FN-T-207 L |
| B.5.2.9 Transportation (p. 175) | UC-T-302 L | Return of a large amount of unconditioned samples and containers (100s of kg) from the lunar surface to Earth with the samples in sealed sample containers | FN-T-208 L, FN-T-212 L |
| B.5.2.9 Transportation (p. 175) | UC-T-303 L | Return of a small amount of refrigerated samples and containers (10s of kg) from the lunar surface to Earth with the samples in sealed conditioned sample containers | FN-T-207 L, FN-T-301 L |
| B.5.2.9 Transportation (p. 175) | UC-T-304 L | Return of a large amount of refrigerated samples and containers (100s of kg) from the lunar surface to Earth with the samples in sealed conditioned sample containers | FN-T-208 L, FN-T-212 L, FN-T-301 L |
| B.5.2.9 Transportation (p. 176) | UC-T-305 L | Return of a small amount of frozen samples and containers (10s of kg) from the lunar surface to Earth with the samples in sealed conditioned sample containers | FN-T-207 L, FN-T-302 L |
| B.5.2.9 Transportation (p. 176) | UC-T-306 L | Return of a large amount of frozen samples and containers (100s of kg) from the lunar surface to Earth with the samples in sealed conditioned sample containers | FN-T-208 L, FN-T-212 L, FN-T-302 L |
| B.5.2.9 Transportation (p. 176) | UC-T-307 L | Return of a large amount of cryogenic samples and containers (100s of kg) from the lunar surface to Earth with the samples in sealed conditioned sample containers | FN-T-208 L, FN-T-212 L, FN-T-303 L, FN-T-306 L, FN-T-309 L, FN-U-404 L, FN-U-407 L, FN-U-410 L, FN-U-413 L, FN-U-416 L |
| B.5.2.9 Transportation (p. 177) | UC-T-309 L | Return of a large amount of unconditioned samples and containers (100s of kg) from cislunar space to Earth with the samples in sealed sample containers | FN-T-212 L |
| B.5.2.9 Transportation (p. 177) | UC-T-311 L | Return of a large amount of refrigerated samples and containers (100s of kg) from cislunar space to Earth with the samples in sealed conditioned sample containers | FN-T-212 L |
| B.5.2.9 Transportation (p. 177) | UC-T-313 L | Return of a large amount of frozen samples and containers (100s of kg) from cislunar space to Earth with the samples in sealed conditioned sample containers | FN-T-212 L |
| B.5.2.10 Utilization (p. 177) | UC-U-101 L | Orbital survey(s) of lunar surface before, during, and after crew mission | FN-U-101 L |
| B.5.2.10 Utilization (p. 177) | UC-U-102 L | Robotic surveillance of potential crewed landing and exploration sites in sunlit areas and non-PSRs in the south pole region on the lunar surface to identify locations of interest | FN-A-103 L †MB |
| B.5.2.10 Utilization (p. 178) | UC-U-105 L | Robotic surveillance of potential crewed landing and exploration sites in sunlit areas and non-PSRs in distributed sites on the lunar surface to identify locations of interest | FN-A-103 L †MB, FN-C-202 L |
| B.5.2.10 Utilization (p. 178) | UC-U-106 L | Robotic surveillance of potential crewed landing and exploration sites in sunlit areas and non-PSRs on the far side on the lunar surface to identify locations of interest | FN-A-103 L †MB, FN-C-203 L |
| B.5.2.10 Utilization (p. 178) | UC-U-107 L | Crew identification of surface samples in sunlit areas and non-PSRs in distributed sites on the lunar surface | FN-C-202 L |
| B.5.2.10 Utilization (p. 178) | UC-U-108 L | Crew identification of surface samples in sunlit areas and non-PSRs in the far side on the lunar surface | FN-C-203 L |
| B.5.2.10 Utilization (p. 178) | UC-U-201 L | Intravehicular science and utilization activities on the lunar surface | FN-P-301 L ‡ MB, FN-P-302 L |
| B.5.2.10 Utilization (p. 179) | UC-U-302 L | Collection, recovery, and packaging of deep subsurface samples, … from non-PSRs and other sunlit areas in the south pole region on the lunar surface | FN-U-305 L |
| B.5.2.10 Utilization (p. 179) | UC-U-304 L | Collection, recovery, and packaging of deep subsurface samples, … from PSRs on the lunar surface | FN-U-306 L |
| B.5.2.10 Utilization (p. 179) | UC-U-305 L | Collection, documentation, and packaging of surface and/or shallow subsurface samples, … from non-PSRs and sunlit areas in distributed locations on the lunar surface | FN-C-202 L |
| B.5.2.10 Utilization (p. 179) | UC-U-306 L | Collection, documentation, and packaging of surface and/or shallow subsurface samples, … from non-PSRs and sunlit areas in the far side on the lunar surface | FN-C-203 L |
| B.5.2.10 Utilization (p. 179) | UC-U-307 L | Collection, recovery, and packaging of deep subsurface samples, … from non-PSRs and other sunlit areas in distributed sites on the lunar surface | FN-C-202 L, FN-U-305 L |
| B.5.2.10 Utilization (p. 180) | UC-U-308 L | Collection, recovery, and packaging of deep subsurface samples, … from non-PSRs and other sunlit areas in the far side on the lunar surface | FN-C-203 L, FN-U-305 L |
| B.5.2.10 Utilization (p. 180) | UC-U-501 L | … demonstration of operational techniques to transfer fluid and/or propellant on the lunar surface | FN-U-507 L |
| B.5.2.10 Utilization (p. 180) | UC-U-503 L | … demonstration of propellant storage for long-durations (year+) in space | FN-U-504 L, FN-U-505 L, FN-U-510 L |
| B.5.2.10 Utilization (p. 180) | UC-U-504 L | … demonstration of propellant storage for long-durations (year+) on the lunar surface | FN-U-503 L, FN-U-506 L, FN-U-509 L |
| B.5.2.10 Utilization (p. 181) | UC-U-701 L | … Impact Chronology on the lunar surface with long-term remote operation | FN-M-303 L, FN-M-502 L |
| B.5.2.10 Utilization (p. 181) | UC-U-702 L | … Geologic Processes on the lunar surface with long-term remote operation | FN-M-303 L, FN-M-502 L |
| B.5.2.10 Utilization (p. 181) | UC-U-704 L | … Solar System Volatiles at distributed locations on the lunar surface with long-term remote operation | FN-M-303 L, FN-M-502 L |
| B.5.2.10 Utilization (p. 181) | UC-U-708 L | … space weather at assets in deep space | FN-P-304 L, FN-T-215 L, FN-U-201 L |
| B.5.2.10 Utilization (p. 181) | UC-U-709 L | … Magnetotail and Solar Wind on the lunar surface with long-term remote operation | FN-M-502 L |
| B.5.2.10 Utilization (p. 182) | UC-U-711 L | Deployment and operation of astrophysics and fundamental physics utilization payload(s) and/or equipment on the far side of the lunar surface with long-term remote operation | FN-M-103 L |
| B.5.2.10 Utilization (p. 182) | UC-U-717 L | … available resources on the lunar surface at the south pole region with long-term remote operation | FN-U-103 L MB |
| B.5.2.10 Utilization (p. 182) | UC-U-718 L | … available resources at distributed locations on the lunar surface with long-term remote operation | FN-M-303 L, FN-M-502 L, FN-U-103 L MB |
| B.5.2.10 Utilization (p. 182) | UC-U-723 L | … bio-regenerative oxygen and water recovery at assets in cislunar space | FN-U-601 L |
| B.5.2.10 Utilization (p. 182) | UC-U-725 L | … plant growth at assets in cislunar asset(s) | FN-U-602 L |
| B.5.2.10 Utilization (p. 183) | UC-U-728 L | … demonstration of recovery of excess propellant from surface asset(s) | FN-U-501 L, FN-U-502 L |
| B.5.2.11 Human Systems (p. 183) | UC-X-103 L | Crew countermeasure capabilities to support the crew for mid-durations (month+) on the lunar surface | FN-X-103 L MB |
| B.5.2.11 Human Systems (p. 183) | UC-X-104 L | Crew countermeasure capabilities to support the crew for mid- (month+) to long-durations (year+) in cislunar space | FN-X-104 L |
| B.5.2.11 Human Systems (p. 183) | UC-X-201 L | In-situ crew training on the lunar surface | FN-X-201 L |
| B.5.2.11 Human Systems (p. 183) | UC-X-202 L | In-situ crew training in cislunar space | FN-X-202 L |
| B.5.2.11 Human Systems (p. 184) | UC-X-203 L | Provision of in-situ training to astronauts for science tasks during mission(s) on the lunar surface | FN-X-201 L |
By section, FE: robotics 5 use cases, C&PNT 4, data 1, habitation 4, ISRU 10, logistics 1, mobility 3, power 4, transportation 11, utilization 27, human systems 5. B.5.2 has no Infrastructure Support (G) section, and the sheet marks no G function Unallocated either. The headings follow the IDs' letters, except that the C&PNT tables are printed with "UC-A-" IDs (p. 169, PDF checked). The titles are those of UC-C-204 L to UC-C-207 L, and the lunar list has no UC-A-204 L to UC-A-207 L (Lunar use cases).
What the use cases show (the wiki's reading of the table):
- Most functions serve several use cases. FN-U-103 L (resource identification) is under six, FN-T-212 L (large cargo from cislunar space to Earth) under eight. FN-C-202 L (PNT at distributed near-side sites) is under eight, and FN-C-203 L (far side) under six.
- UC-T-307 L, cryogenic sample return, carries ten unallocated functions, the most of any use case: the whole cryogenic chain from surface stowage to Earth.
- Utilization use cases take a third of B.5.2 (27 of 75). Many are science deployments "with long-term remote operation" that need surface mobility or cargo repositioning at distributed sites (FN-M-303 L, FN-M-502 L).
Moon Base Phase 1 functional gaps against the allocation¶
This is a join made by the wiki. The Users Guide names 31 function IDs as Phase 1 functional gaps (Users Guide, pp. 8–10; Phase 1 functional gaps). The FE+ sheet and the ADD's Appendix B.3 and B.5 allocate the same IDs. None of the three refers to the others. The guide defines a functional gap as an architecture function "either currently unallocated to any existing elements, or functions that need additional performance to be fully satisfied" (p. 9), and doesn't say which half applies to each. The table only puts the sources side by side.
| Guide's group | Function | FE+ allocation (sheet) | ADD B.3, FE elements | In ADD B.5? |
|---|---|---|---|---|
| Autonomous systems and robotics | FN-M-401 L | Human Landing System, CLPS Provider Landers | CLPS, HLS | no |
| Autonomous systems and robotics | FN-M-501 L | Lunar Terrain Vehicle, Lunar Utility Rover | LTV, LUR | no |
| Autonomous systems and robotics | FN-A-104 L | Lunar Terrain Vehicle, Lunar Utility Rover | LTV, LUR | no |
| Autonomous systems and robotics | FN-A-105 L | Lunar Utility Rover | LUR | yes (UC-A-103 L) |
| Autonomous systems and robotics | FN-A-201 L | NSN/DSN | Near Space Network and Deep Space Network | no |
| Autonomous systems and robotics | FN-A-302 L | Lunar Terrain Vehicle, Lunar Utility Rover | LTV, LUR | no |
| Autonomous systems and robotics | FN-A-401 L | NSN/DSN | Near Space Network and Deep Space Network | no |
| Communications and PNT | FN-C-101 L | Gateway Expanded Capability, LCRNS, NSN/DSN, Initial Surface Habitation, Communication/PNT Asset | Gateway, Initial Surface Habitat, NSN and DSN, LCRNS | no |
| Communications and PNT | FN-C-103 L | Lunar Terrain Vehicle, Pressurized Rover, Initial Surface Habitation, Communication/PNT Asset | Initial Surface Habitat, LTV, Pressurized Rover | no |
| Communications and PNT | FN-C-105 L | Gateway Expanded Capability, LCRNS, NSN/DSN, Initial Surface Habitation, Communication/PNT Asset | Gateway, Initial Surface Habitat, NSN and DSN, LCRNS | no |
| Communications and PNT | FN-C-201 L | LCRNS | LCRNS | no |
| Habitation systems | FN-H-101 L | Pressurized Rover, Initial Surface Habitation | Initial Surface Habitat, Pressurized Rover (HLR: HLS) | no |
| Habitation systems | FN-H-102 L | Unallocated | none | yes (UC-H-102 L) |
| Habitation systems | FN-X-103 L | Unallocated | none | yes (UC-X-103 L) |
| Habitation systems | FN-L-301 L | Unallocated (HLR: Human Landing System) | none (HLR: HLS) | yes (UC-H-101 L, UC-H-102 L, UC-L-201 L) |
| Habitation systems | FN-H-201 L | Pressurized Rover, Initial Surface Habitation | Initial Surface Habitat, Pressurized Rover | no |
| Logistics systems | FN-L-101 L | Initial Surface Habitation | Initial Surface Habitat | no |
| Logistics systems | FN-L-201 L | Pressurized Rover, Initial Surface Habitation | Initial Surface Habitat, Pressurized Rover | no |
| Logistics systems | FN-L-203 L | Unallocated | none | yes (UC-I-104 L, UC-L-201 L) |
| Logistics systems | FN-L-205 L | Unallocated | none | yes (UC-I-105 L, UC-L-201 L) |
| Mobility systems | FN-M-302 L | Lunar Terrain Vehicle | LTV | no |
| Mobility systems | FN-M-304 L | Lunar Terrain Vehicle | LTV | no |
| Mobility systems | FN-A-103 L | Lunar Terrain Vehicle, Pressurized Rover | Pressurized Rover only | yes (UC-U-102 L, UC-U-105 L, UC-U-106 L) |
| Mobility systems | FN-U-103 L | Unallocated | none | yes (UC-I-101 L, UC-I-102 L, UC-I-103 L, UC-I-106 L, UC-U-717 L, UC-U-718 L) |
| Power systems | FN-P-101 L | Lunar Nuclear Fission System, and Unallocated | Lunar Nuclear Fission System | yes (UC-P-101 L) |
| Power systems | FN-P-102 L (guide's ID; its title is FN-P-202 L's) | Unallocated. FN-P-202 L is also Unallocated. | none; none for FN-P-202 L either | yes (UC-P-102 L); FN-P-202 L also (UC-P-101 L) |
| Power systems | FN-P-301 L | Lunar Nuclear Fission System, and Unallocated | Lunar Nuclear Fission System | yes (UC-P-301 L, UC-U-201 L) |
| Power systems | FN-P-401 L | Initial Surface Habitation, Lunar Nuclear Fission System | Initial Surface Habitat, Lunar Nuclear Fission System | no |
| Power systems | FN-P-402 L | Initial Surface Habitation | Initial Surface Habitat | no |
| Transportation systems (cargo) | FN-T-201 L | Human Landing System, CLPS Provider Landers | CLPS, HLS | no |
| Transportation systems (cargo) | FN-T-202 L | Lunar Surface Cargo Lander | Lunar Surface Cargo Lander | no |
Result.
- The sheet marks 9 of the 31 Unallocated (FN-H-102 L, FN-X-103 L, FN-L-203 L, FN-L-205 L, FN-L-301 L, FN-P-101 L, FN-P-102 L, FN-P-301 L, FN-U-103 L). Two of the nine, FN-P-101 L and FN-P-301 L, are also on the fission system.
- The ADD's B.5 lists 11: those nine, plus FN-A-105 L and FN-A-103 L. Its B.3 maps both of those
to elements.
- Seven of the 11 have no Foundational Exploration element in B.3: FN-H-102 L, FN-X-103 L, FN-L-301 L, FN-L-203 L, FN-L-205 L, FN-U-103 L and FN-P-102 L.
- The other four have one: FN-A-105 L, FN-A-103 L, FN-P-101 L and FN-P-301 L.
- The other 20 have at least one Foundational Exploration element in both sources, and are not in B.5. Read with the guide's definition, that would make them gaps for "additional performance", but no source says so.
The guide says "A full list of unallocated functions can be found in an appendix of the Architecture Definition Document" (p. 9). By its title, that is B.5 (the wiki's match). B.5 holds 11 of the guide's 31, and the other 20 are allocated. The guide doesn't say which half of its definition each one falls under (open question 65). The sheet and the ADD are from December 2025, the guide from April 2026. The open question 40 mix-up doesn't change the counts: FN-P-102 L and FN-P-202 L are both unallocated in both sources. The join is recorded with the other wiki-made links under open question 11.
HLR against FE+¶
- Allocation added in FE+: FN-C-205 L (lunar time scale) is "Unallocated" in HLR and on the Communication/PNT Asset in FE+. FN-M-504 L has no mark at all in the HLR matrix and isn't in the HLR asset table; FE+ gives it to the LTV.
-
Allocation dropped in FE+ (as printed). Four pairs are in the HLR sheet but not the FE+ sheet:
- Orion: FN-U-205 L, which FE+ gives to Gateway Expanded Capability only
- Human Landing System: FN-H-101 L (FE+: Pressurized Rover, Initial Surface Habitation)
- Human Landing System: FN-L-301 L, surface waste (FE+: Unallocated)
- Human Landing System: FN-U-401 L, stowing samples (FE+: LTV, Pressurized Rover, Initial Surface Habitation)
The sheet doesn't say whether these are changes of plan or slips.
-
Every other HLR asset–function pair recurs in FE+ (the wiki's check of the two asset tables).
- The ADD does the same. B.3's HLR and FE tables drop the same four pairs: Orion pp. 160–161, HLS pp. 154–156. They also drop a fifth: HLS FN-U-414 L, "Provide resources to condition refrigerated sample containers on the lunar surface", which B.3 has for HLS in HLR but not in FE. The sheet has the reverse: FN-U-414 L on HLS in FE+ and not in its HLR list. FN-C-205 L is unallocated in the ADD's HLR (B.5.1), but in FE no ADD table names it (above).
The 2024 allocation (ACR24 lunar table)¶
NASA's 2024 Lunar Objective Mapping Tables have the same kind of allocation, a function × asset matrix
and an asset table (2024 lunar table, files
asset-function-matrix.csv and asset-function-table.csv; row = asset ID or function ID). It is 2024
context. The comparison below is the wiki's, asset by asset and function by function, and shows what
changed by December 2025. It doesn't re-list the 2024 allocation.
How the 2024 sheets differ in form.
- One header, spelled out: "ASSET MAPPING TO SCIENCE/RESEARCH PAYLOADS AND TECH DEMOS IS FORWARD WORK". The 2025 matrices say only "FORWARD WORK". It may be the same label shortened; the 2025 file doesn't say (open question 42).
- Asset IDs EM-001 to EM-018 (no EM-011), each with "-HLR" or "-FE", and columns labeled "HLR" and "FE" rather than "FE+".
- Fewer assets. No Lunar Utility Rover or Lunar Nuclear Fission System (both added in Rev C) and no Communication/PNT Asset. The other 16 columns have the 2025 names.
FE in 2024 against FE+ in 2025¶
| Asset | 2024 FE | 2025 FE+ | What changed |
|---|---|---|---|
| Space Launch System, Orion, Gateway Expanded Capability, LCRNS, xEVA System, Gateway Logistics Element, NSN/DSN, Human-Class Delivery System, Lunar Surface Cargo Lander | 6, 14, 23, 5, 9, 7, 10, 5, 4 | the same | nothing |
| Exploration Ground Systems | 7 | 9 | adds FN-G-106 L and FN-G-107 L, which are new functions in 2025 |
| Human Landing System | 27 | 29 | adds FN-U-414 L and FN-U-415 L (conditioning refrigerated and frozen sample containers on the surface) |
| CLPS Provider Landers | 7 | 6 | drops FN-M-402 L, "Unload a moderate amount of cargo (1000s of kg) on the lunar surface", which becomes Unallocated |
| Lunar Terrain Vehicle | 17 | 19 | adds FN-A-103 L (reconnaissance) and FN-A-302 L (safeguards near crew) |
| Pressurized Rover | 22 | 21 | adds FN-A-103 L; drops FN-U-414 L and FN-U-415 L |
| Initial Surface Habitation | 19 | 24 | adds FN-C-101 L, FN-C-105 L, FN-C-108 L, FN-D-101 L and FN-D-201 L |
| Equipment | 6 | 8 | adds FN-U-303 L and FN-U-304 L (recovering shallow samples) |
| Lunar Utility Rover | 6 | new | |
| Lunar Nuclear Fission System | 3 | new | |
| Communication/PNT Asset | 8 | new | |
| Unallocated | 81 (82 rows: FN-D-203 L is listed twice) | 76 | below |
Unallocated, FE: 81 against 76. 75 functions are Unallocated in both.
- Six leave Unallocated by 2025:
- FN-M-503 L, repositioning 1000s of kg at the South Pole: to the Lunar Utility Rover
- FN-A-105 L, robots with logistics carriers: to the Lunar Utility Rover
- FN-A-302 L, safeguards for automated assets near crew: to the LTV and the Lunar Utility Rover
- FN-A-103 L, reconnaissance: to the LTV and the Pressurized Rover
- FN-C-205 L, the lunar time scale: to the Communication/PNT Asset
- FN-D-201 L, local data processing on the surface: to Initial Surface Habitation and the Communication/PNT Asset
- One joins Unallocated: FN-M-402 L, from CLPS Provider Landers.
- South Pole power. FN-P-101 L and FN-P-301 L are Unallocated in both years; 2025 also puts them on the fission system. FN-P-401 L is on Initial Surface Habitation in 2024, and on the habitat and the fission system in 2025.
Five of the six went at least partly to an asset that is new in 2025, the Lunar Utility Rover or the Communication/PNT Asset. FN-A-103 L went only to rovers that were already in the 2024 table (the wiki's reading of the table).
HLR in 2024 against HLR in 2025¶
2024 allocates all 206 functions for HLR; 2025 lists 58. In the 2024 table, every function is either on an HLR asset (78) or in the HLR "Unallocated" column (128; the wiki's count, 78 + 128 = 206). The 2025 HLR sheet lists 58 functions, with one Unallocated, FN-C-205 L. ADD Revision B.1 (Management Directive 4, 04/04/2025) lists "Corrections to Resolve Unallocated Function Discrepancies for the Human Lunar Return Segment": "Updated list of unallocated functions for the Human Lunar Return segment" and "Identified functions targeted for the Human Lunar Return segment" (ADD Rev C, pp. 3–4). That those corrections are what turned the 2024 column into the 2025 list is the wiki's reading.
| Asset | 2024 HLR | 2025 HLR | What changed |
|---|---|---|---|
| Space Launch System, Exploration Ground Systems, LCRNS, xEVA System, Gateway Logistics Element | 6, 7, 5, 5, 7 | the same | nothing |
| Orion | 15 | 13 | drops FN-T-307 L and FN-T-308 L (conditioning samples from cislunar space to Earth) |
| Gateway | 18 | 14 | drops FN-P-303 L, FN-D-102 L, FN-D-202 L and FN-A-404 L |
| Human Landing System | 23 | 20 | adds FN-H-101 L, FN-L-301 L and FN-U-401 L, all three in the 2024 HLR "Unallocated" column; drops FN-T-304 L, FN-T-305 L, FN-D-101 L, FN-D-102 L, FN-D-105 L and FN-U-414 L |
| CLPS Provider Landers | 7 | 3 | drops FN-T-203 L, FN-T-205 L, FN-T-402 L and FN-M-402 L |
| NSN/DSN | 9 | 5 | drops FN-C-104 L, FN-A-201 L, FN-A-401 L and FN-A-402 L |
| Equipment | 6 | 1 | 2024: six stowage functions (FN-U-402 L, FN-U-403 L, FN-U-405 L, FN-U-406 L, FN-U-408 L, FN-U-409 L); 2025: FN-U-303 L only |
| Unallocated | 128 | 1 | FN-C-205 L in both |
Orion's FN-U-205 L, which HLR against FE+ lists as dropped between the 2025 HLR and FE+ sheets, is on Orion in 2024 HLR and not in 2024 FE either.
What it shows for the ADD's own tables¶
ADD Rev C's B.3 and B.5 differ from the 2025 sheet in a few places (open questions 43 and 64). The 2024 table agrees with the ADD in some of them and not in others:
| Function | 2024 table | 2025 sheet | ADD B.3 | ADD B.5 |
|---|---|---|---|---|
| FN-A-103 L, reconnaissance | FE: Unallocated | LTV, Pressurized Rover | Pressurized Rover (p. 162) | unallocated (UC-U-102 L, UC-U-105 L, UC-U-106 L) |
| FN-A-105 L, robots with logistics carriers | FE: Unallocated | Lunar Utility Rover | Lunar Utility Rover (p. 160) | unallocated (UC-A-103 L) |
| FN-M-402 L, unloading 1000s of kg | CLPS Provider Landers, HLR and FE | Unallocated | not named | not named |
| FN-M-503 L, repositioning 1000s of kg | FE: Unallocated | Lunar Utility Rover | Lunar Utility Rover | not listed |
| FN-A-302 L, safeguards near crew | FE: Unallocated | LTV, Lunar Utility Rover | LTV, Lunar Utility Rover | not listed |
| FN-D-201 L, local data processing | FE: Unallocated | Initial Surface Habitation, Communication/PNT Asset | Initial Surface Habitat | not listed |
| FN-C-205 L, lunar time scale | Unallocated, HLR and FE | HLR: Unallocated; FE+: Communication/PNT Asset | not named | HLR only (B.5.1) |
| Gateway FN-D-102 L and FN-P-303 L, HLR | on Gateway | not on Gateway | on Gateway (p. 151) | |
| HLS FN-U-414 L, HLR | on HLS | not on HLS | on HLS (p. 155) |
What the table shows (the wiki's reading):
- The three HLR pairs only the ADD has (open question 43) are all in the 2024 table.
- The two functions the ADD both maps and lists as unallocated (open question 64), FN-A-103 L and FN-A-105 L, were Unallocated in 2024. B.5 agrees with 2024 on them, and B.3 with 2025.
- Not a simple lag. On FN-M-503 L, FN-A-302 L and FN-D-201 L, which also left Unallocated by 2025, B.3 and B.5 both agree with the 2025 sheet. FN-M-402 L matches neither year: on CLPS in 2024, Unallocated in the 2025 sheet, in no ADD table.
No source explains these differences. The wiki records them and doesn't say which of the ADD's tables is out of date.
Element pages¶
Each element page now has its own B.3 list, under "Functions (ADD Appendix B.3)", with the differences from the sheet and the Phase 1 functional gaps among its functions (the wiki's join). The Lunar Utility Rover and Lunar Nuclear Fission System pages already had theirs from the 2025 Architecture Update, and both match B.3 and the sheet.
Related pages¶
Lunar objectives · Objectives: the ten goals · Lunar functions · Use cases and functions · Elements · Moon Base Phase 1 functional gaps · Gaps index · Lunar decomposition source page
Sources¶
Lunar objective decomposition spreadsheet,
sheets "HLR Functional Allocation", "HLR Asset to Function Table", "FE+ Functional Allocation" and
"FE+ Asset to Function Table" ·
Users Guide, pp. 8–10 ·
2025 Architecture Update, pp. 5, 7 ·
ADD Rev C, pp. 3–4, 48, 117–127, 148–185 (PDF checked on
pp. 158, 166, 169, 175 and 176) ·
2024 lunar table, files asset-function-matrix.csv
and asset-function-table.csv