What is an Analysis of Alternatives?

An analysis of alternatives (AoA) is the study the Department of Defense (DoD) runs before a major program starts, to compare candidate solutions to a capability need on cost, schedule, performance, and risk. DoD Instruction (DoDI) 5000.84, effective August 4, 2020, sets the procedure for major defense acquisition programs (MDAPs). The Director of Cost Assessment and Program Evaluation (DCAPE) issues the study guidance, approves the study plan, and judges whether the finished AoA was adequate. The analysis should take no more than 9 months, a limit Congress set in section 832 of the National Defense Authorization Act (NDAA) for Fiscal Year 2020.

Who writes the guidance

10 U.S.C. 139a, added by Public Law 111-23 on May 22, 2009, makes DCAPE the principal official for formulating study guidance for MDAP analyses of alternatives, and for performing such analyses as the Secretary of Defense directs. The section also requires an annual report to the congressional defense committees reviewing the prior fiscal year's AoAs.

DoDI 5000.84 gives DCAPE two duties: issue study guidance and approve study plans, and evaluate the adequacy of each AoA. The Under Secretaries of Defense for Research and Engineering and for Acquisition and Sustainment, and the DoD Chief Information Officer, advise on the guidance.

DoDI 5000.85, on the major capability pathway, extends the pattern below the MDAP level. At the Materiel Development Decision (MDD), DCAPE, or the DoD Component equivalent for acquisition category (ACAT) II or lower programs, presents the study guidance.

What the study guidance must require

At minimum, DoDI 5000.84 says the guidance will require:

• A trade-space analysis of cost, schedule, and performance, including each option's effect on mission accomplishment.
• One alternative that represents the status quo, plus enough others to explore the trade space.
• Excursions that carry a feature with substantive mission impact into the other alternatives.
• Consideration of evolutionary acquisition, prototyping, and a modular open system approach.
• A life-cycle cost analysis that includes the fully burdened cost of fuel.
• An assessment against the cost and schedule objectives recommended by the Joint Requirements Oversight Council.
• Affordability, including any goals set by the milestone decision authority (MDA).

The instruction also asks the study team to state the limitations and uncertainty of its findings, and to run a sensitivity analysis showing how results depend on key parameters.

The study plan and the nine-month clock

The DoD Component notifies DCAPE's office of an impending MDAP 60 business days before the MDD. DCAPE issues guidance by 40 business days before. The Component submits its study plan by 20 business days before, with a memorandum certifying that the study team, contract support, clearances, threat data, and prioritized requirements with metrics are in place.

The approval date of the study plan, typically at the MDD, is the start date of the AoA. Section 832 lists four grounds for waiving the 9-month timeline: extreme technical complexity, a need for more intelligence, insufficient technical expertise, or another sufficient reason the Secretary determines. A late study or a waiver triggers a report to the congressional defense committees.

The Component briefs final results to a study advisory group by the earliest of three dates: 55 business days before release of a request for proposals for the next milestone, the MDA's first milestone review, or 9 months from the start. The written report follows within 40 business days, and DCAPE's adequacy memorandum within 40 business days after that.

When the law calls for one

Public Law 118-159, enacted December 23, 2024, rewrote the milestone statutes. Section 4251 now lists factors to be considered before Milestone A. One is an AoA performed consistent with DCAPE study guidance, or, in lieu of one, early experimentation with a combatant commander. Section 4252 lists a completed AoA, or the same experimentation alternative, as a Milestone B factor. A program may not receive Milestone A approval, or otherwise start before Milestone B, until the MDA confirms the Milestone A factors were considered. At each milestone the MDA issues a written record of decision and sends it to the congressional defense committees within 15 days.

DoDI 5000.84, which predates that change, still ties AoAs to certifications under sections 2366a and 2366b, the old numbers of sections 4251 and 4252.

What GAO found about AoA quality

The Government Accountability Office (GAO) collected information from 32 MDAPs for its September 2009 report, when the Program Analysis and Evaluation office held the guidance role. Ten of the 32 had not conducted AoAs. Of the 22 that had, 13 examined a limited number of alternatives within a single concept, and 12 made only limited assessments of each alternative's risks. One of the 9 programs with a broad set of alternatives saw high cost or schedule growth, against 8 of the 13 with a narrow set. In 9 of the 22, the AoA was compressed or run alongside other planning, and 7 of those 9 were limited.

GAO's March 2020 Cost Estimating and Assessment Guide sets 22 AoA best practices in five phases: initialize, identify alternatives, analyze, document and review, and select a preferred alternative. A case study in the guide found that the Amphibious Combat Vehicle's 2014 AoA update, read with related earlier studies, met 15 of the 22.

What to check

• Which DCAPE study guidance does the AoA follow, and when was the study plan approved?
• Does it include a status quo alternative and enough others? GAO found 13 of 22 AoAs used a narrow set.
• Are technical and schedule risks compared across alternatives, not only cost and effectiveness?
• Was the AoA finished within 9 months, and if not, are the waiver and the report to Congress on file?
• Does the report show a sensitivity analysis and state its limitations?
• Does the milestone record of decision say whether an AoA or early experimentation with a combatant commander was considered?

Azcuna's LEDGER turns a trade study into a Decision Package in which every number cites its source and AI agents draft but never decide. It was proposed to the Army under SBIR Phase I topic ARM26BX06-NV012, and the proposal was submitted on October 21, 2026.

Sources

1. 1DoD Instruction 5000.84, Analysis of Alternatives, August 4, 2020 · Office of the Director, Cost Assessment and Program Evaluation
2. 2DoD Instruction 5000.85, Major Capability Acquisition, August 6, 2020, Change 1 November 4, 2021 · Office of the Under Secretary of Defense for Acquisition and Sustainment
3. 3United States Code, 2024 Edition, Title 10, Section 139a - Director of Cost Assessment and Program Evaluation · U.S. Government Publishing Office
4. 4United States Code, 2024 Edition, Title 10, Section 4251 - Major defense acquisition programs: factors to be considered before Milestone A approval · U.S. Government Publishing Office
5. 5United States Code, 2024 Edition, Title 10, Section 4252 - Major defense acquisition programs: factors to be considered before Milestone B approval · U.S. Government Publishing Office
6. 6Public Law 116-92, National Defense Authorization Act for Fiscal Year 2020 · U.S. Government Publishing Office
7. 7GAO-09-665, Defense Acquisitions: Many Analyses of Alternatives Have Not Provided a Robust Assessment of Weapon System Options · U.S. Government Accountability Office, September 2009
8. 8GAO-20-195G, Cost Estimating and Assessment Guide: Best Practices for Developing and Managing Program Costs · U.S. Government Accountability Office, March 2020

Where this shows up in our work

• LEDGER, auditable Army acquisition decisions turns a trade study into a package where every number cites its source and AI drafts but never decides.
• ELLMENT, the offline LLM for E-2D crews answers a crew's question from the aircraft's own manuals and cites the page, with no network.
• TRACE, the offline S1000D and IETM viewer opens S1000D, MIL-STD-3001 and PDF technical manuals on a tablet with every marking intact.