A promising medical innovation begins with an important question: could this work?
A strong NIH SBIR Phase I proposal turns that question into a focused research plan: what will you test, how will you measure success, and what will the results tell you about moving forward?
For biotech startups, drug developers, and medical device innovators, that distinction matters. Phase I focuses on establishing a project’s feasibility, technical merit, and commercial potential. Your application should explain not simply what your team plans to do, but what evidence those activities will generate.
Clear milestones connect the scientific work to that evidence.
What Are Milestones in an NIH SBIR Phase I Application?
Milestones are defined outcomes that help establish whether a project has achieved its objectives.
An activity describes the work:
“Test the prototype in a laboratory setting.”
A milestone describes the result that would support a decision:
“Demonstrate that the prototype meets a predefined performance threshold under conditions relevant to its intended use.”
NIH’s SBIR/STTR application instructions call for clear, measurable milestones for each Phase I aim. Strong milestones explain what success looks like, using quantitative measures whenever appropriate.
The practical distinction is straightforward: completing an experiment is not necessarily the same as demonstrating feasibility.
Start With the Uncertainty Your Project Needs to Resolve
Before drafting milestones, identify the most important technical uncertainty standing between your innovation and its next development stage.
Depending on the project, that uncertainty might involve:
Whether a therapeutic candidate produces the intended biological effect.
Whether a diagnostic assay can distinguish relevant samples reliably.
Whether a medical device performs consistently under representative conditions.
Whether a manufacturing approach can produce material with the required characteristics.
These are illustrative planning questions, not universal NIH requirements. The right question depends on your technology, its development stage, and the funding opportunity.
A useful starting point is:
“At the end of this project, what evidence would justify continued development?”
That question helps keep the proposal focused on feasibility rather than a collection of loosely connected experiments.
Connect Each Specific Aim to a Meaningful Outcome
Specific aims describe what the project intends to accomplish. Milestones explain how the team will recognize success.
Your Specific Aims page should provide an understandable overview of the project and explain how the proposed work sets up the next development step.
For each aim, consider four questions:
What technical question are we answering?
What experiment, model, or evaluation will answer it?
What result would constitute meaningful success?
How would that result inform the next development decision?
The goal is a coherent connection between the technical uncertainty, research activity, measurable result, and development decision.
If that connection is difficult to explain, the aim may need refinement before the rest of the application is written.
Examples for Drug and Medical Device Innovators
The examples below illustrate milestone structure. They are not NIH-prescribed thresholds or substitutes for a project-specific scientific plan.
Therapeutic Development
Activity-only statement:
“Evaluate the lead candidate in a disease-relevant model.”
More decision-oriented structure:
“Evaluate whether the lead candidate achieves a predefined biological effect relative to the selected control, while meeting the study’s prespecified tolerability criteria.”
The stronger structure identifies the evidence the study needs to produce. The actual endpoints, thresholds, controls, and model must be justified for the project.
Medical Device Development
Activity-only statement:
“Build and test a functional prototype.”
More decision-oriented structure:
“Demonstrate that the prototype meets predefined accuracy and repeatability criteria across a specified range of intended operating conditions.”
This moves the emphasis from building something to establishing whether it performs adequately for the next stage of development.
Diagnostic Development
Activity-only statement:
“Assess assay performance.”
More decision-oriented structure:
“Demonstrate that the assay meets predefined analytical performance criteria in the selected sample types, using an appropriate reference method.”
The appropriate measures will depend on the assay, its intended use, and the question the Phase I project is designed to answer.
How Do You Choose a Defensible Success Threshold?
A number is not automatically a meaningful milestone.
A useful threshold should have a reason behind it. When developing your proposal, consider whether the proposed target is supported by:
The intended use of the technology.
Relevant published research.
Preliminary findings, where available.
Appropriate comparators or reference methods.
Requirements of the next planned development step.
For example, a device performance target should help answer whether the technology is worth advancing—not simply demonstrate an improvement that is easy to measure.
Quantitative criteria are valuable when appropriate, but they are not the only option. Some aims may require qualitative success criteria; those criteria should still be clearly stated.
The objective is not to force every outcome into a number. It is to make the interpretation of the results understandable.
Explain What Happens if Results Fall Short
A useful planning exercise is to ask what your team would do if an experiment does not meet its target.
Would the findings support:
Refining the prototype?
Adjusting a formulation or assay?
Narrowing the intended application?
Conducting additional validation?
Discontinuing an approach that does not justify further investment?
These questions can expose weaknesses in a research plan before submission. They also help distinguish a genuine development milestone from a routine task.
For Fast-Track applications, this decision logic is especially important: a clear go/no-go milestone helps determine the transition from Phase I to Phase II.
Keep the Phase I Project Connected to the Larger Product Vision
Your company may ultimately aim to improve patient outcomes, change clinical practice, or bring a new therapeutic to market. Your Phase I project needs a narrower, testable objective.
NIH SBIR Phase I is not the same thing as a Phase I clinical trial. The small-business funding phases and clinical trial phases describe different processes.
A focused proposal should explain both:
What this project will establish.
Why that evidence matters for the product’s longer-term development.
That connection helps readers understand the role of the proposed research without implying that one award will resolve every scientific, regulatory, or commercial challenge.
A Practical Milestone Review Before You Submit
For each proposed milestone, ask:
Is the outcome clearly defined?
Is the success criterion measurable or otherwise unambiguous?
Is the threshold scientifically justified?
Can the work be completed with the proposed time, budget, and resources?
Does the outcome inform a meaningful next step?
Consider organizing your initial concept into a concise Specific Aims page and discussing it with the relevant NIH program staff.
Always check the current funding opportunity and applicable application instructions for requirements specific to your submission.
Turn a Promising Concept Into a Focused Funding Strategy
A strong Phase I proposal makes the development logic clear: here is the uncertainty, here is how we will test it, and here is the evidence that would justify moving forward.
At Blue Haven Grant Consultants, we help innovators connect their scientific objectives with a focused SBIR/STTR application strategy. Our services include project evaluation, Specific Aims development, and proposal preparation, supported by our proprietary Significance-Innovation Analysis™ process.
Our BHGC Pay Upon Award™ model ties our consulting payment to a successful award.
Contact Blue Haven Grant Consultants for a free consultation to discuss your project and its next funding step.
SEO Publishing Details
SEO title: NIH SBIR Phase I Milestones: A Guide for Life Science Startups
Meta description: Learn how to develop clear NIH SBIR Phase I milestones that connect research aims, measurable outcomes, and the next step for your innovation.
Suggested URL slug: nih-sbir-phase-i-milestones
Primary search phrase: NIH SBIR Phase I milestones
Related phrases:
NIH SBIR Specific Aims
SBIR Phase I feasibility
Medical device SBIR funding
Biotech SBIR grant writing
NIH SBIR success criteria
Suggested internal links:
Link “Is your company ready to apply?” to your founder readiness checklist.
Link “Translating university research into a startup” to your university-researcher article.
Link the consultation call to action to your existing contact or consultation page.