Why Phase II is the real prize
Phase I is a feasibility study. Phase II is the actual project. A Phase I award of $150K to $250K pays for six months of focused technical work and produces a prototype or evidence of feasibility. A Phase II award of $1M to $2M pays for 24 months of prototype maturation, integration, and demonstration, and it is the award that converts SBIR revenue from a one-time grant into a real contract stream. For a small AI firm, Phase II is where SBIR starts to matter economically.
Phase II Evaluation Factor Weights (DoD)
The Phase II proposal is written and submitted during Phase I — not after. Firms that wait for the Phase I final report to start writing have already lost. Commercialization conversations begin in month 3.
The mistake most first-time awardees make is treating Phase II as a sequel written at the end of Phase I. By the time the Phase II solicitation closes, you have a few weeks to turn your Phase I report into a $1-2M proposal. Firms that do well on Phase II treat it as a parallel track starting in month 3 of Phase I — commercialization conversations, customer discovery, letter collection, and architectural planning happen while the technical work is still in flight.
How the scoring shifts
Phase II reviewers grade against a different rubric than Phase I reviewers. In Phase I, the technical volume dominates because the question is whether the idea can work at all. In Phase II, the question is whether it can be turned into a product the government and commercial market will actually use. Commercialization climbs from 20-30% of the score to 40-50%. Technical feasibility is still present but is evaluated through the Phase I results rather than from first principles.
| Evaluation axis | Phase I weight | Phase II weight |
|---|---|---|
| Technical merit / feasibility | 50-60% | 30-40% |
| Commercialization potential | 20-30% | 40-50% |
| Team and past performance | 10-20% | 15-20% |
| Phase I performance (new) | — | 10-15% |
The new axis — Phase I performance — is a meaningful filter. A firm that delivered its Phase I on time, hit its milestones, and produced a credible final report is presumed capable of executing Phase II. A firm that missed milestones or filed a thin final report is at a material disadvantage before anyone reads the Phase II technical volume.
The prototype-to-deployment pitch
A Phase II technical volume is fundamentally a different document from Phase I. The core section is no longer "how will this work" but "how will this become a product that integrates with the government customer and scales to the commercial market." The reviewer wants to see three things: an complete system architecture, a deployment plan with named integration targets, and a risk register that the firm has thought about seriously.
Concrete elements to include: the target architecture (compute, data flow, security boundary, interfaces), the integration plan with the specific government system, the test and demonstration plan with measurable acceptance criteria, the handoff to Phase III (who operates it, who sustains it, who owns the data), and the technical risk register with mitigation plans for the top 5-7 risks.
Pre-positioning during Phase I
Everything you want to say in the Phase II proposal gets easier if you set it up during Phase I. Concretely, during the six months of Phase I execution you should:
- Hold bi-weekly check-ins with the Phase I technical POC. Every conversation is an opportunity to understand the end-user problem more precisely and to surface the operational constraints that Phase II needs to address.
- Request at least two in-person or video meetings with the program office that owns the transition. These are the people who will either champion or sink your Phase II.
- Collect letters of support aggressively. Every customer conversation ends with "would you be willing to write us a letter for Phase II." Most will say yes if you ask clearly.
- Build out the commercialization plan in parallel. By the time you start writing Phase II, you should have a 10-page draft commercialization plan that you can compress to 4-5 pages for the proposal.
- File for provisional indirect rate approval if you have not already. Phase II budgets are larger and the indirect numbers get more scrutiny.
The commercialization section is the scoring fulcrum
In Phase II, the commercialization section is what separates selected from selectable. Reviewers want to see a specific federal customer with identified follow-on funding, a specific commercial customer or customer segment with demonstrated interest, a five-year revenue projection that is defensible, and a capitalization plan that does not assume SBIR forever. The strongest Phase II commercialization plans look almost identical to a Series A deck: problem, solution, market, traction, team, plan.
A pullquote-worthy test: if your commercialization plan could be word-for-word copied into another firm's proposal, it is generic and will score generically. If it names specific customers, specific dollars, specific integrations, and specific milestones, it will score at the top of the range.
The matching-funds leverage
Phase II Plus, available at some agencies, matches external funding dollar-for-dollar up to a cap. A firm that secures a $500K commitment from a program office or a commercial customer can turn a $1.8M Phase II into a $2.3M or $2.8M program by adding matching funds. See our Phase II Plus deep dive for the mechanics.
When to walk away from a Phase II
Not every Phase I should convert. If the Phase I results showed the approach does not work, writing a hopeful Phase II is bad for the firm — a weak Phase II with thin results damages the PI's track record with the agency. Better to deliver a clean Phase I final report that honestly reports what was learned, decline the Phase II, and apply the credibility to a different topic. Agencies remember firms that are honest about what does not work.
Timeline and cadence
A typical Phase II timeline: Phase I kickoff → month 3 start commercialization track → month 4 request Phase II letters → month 5 draft technical approach and commercialization sections → month 6 deliver Phase I final report and submit Phase II proposal within the agency window (usually 30-60 days post-Phase-I). Some agencies run continuous Phase II windows; most run on a fixed cycle tied to the Phase I cohort.
Frequently asked questions
Typically $1M-$2M over 24 months. DoD and NIH often fund at $1.7-1.9M. Phase II Plus with matching can push total to $3M+.
Conditional on winning Phase I, 40-60% across agencies. DoD and NIH are higher.
Commercialization weight climbs to 40-50%; technical feasibility drops since Phase I demonstrated it.
Month 3 of Phase I. Waiting until the final report is a losing pattern.
Weak commercialization, no identified customer, or a thin Phase I final report.
Yes at DoD, NIH, and others, with documented Phase-I-equivalent work.