This guide walks through producing an SRS document that defines what software must do and how it must perform, and that all stakeholders can agree on before development begins.
1. Understand the purpose of an SRS
An SRS defines what the software must do and how it must perform. It creates a shared understanding between customers, developers, engineers, and project managers by documenting behaviors, functions, performance expectations, and constraints. It includes functional and non-functional requirements, but excludes design decisions and information not explicitly required by the customer.
Once approved, the SRS becomes a formal agreement guiding development, validation, and future reference — acting as an "insurance policy" that resolves scope uncertainties by referring back to the document.
2. Know why you're writing one
- Confirm customer understanding: Verify the organization fully understands the customer's needs, challenges, and expected system behaviors. Use charts or tables to improve clarity.
- Break down complex work: Organize extensive requirements into smaller, manageable components.
- Act as a parent document: Use the SRS as the foundation for scopes of work, design specifications, testing protocols, and validation plans.
- Catch problems early: Fix issues at the requirements stage, where they are far cheaper than during development.
3. Draft the document in three parts
Before writing, make sure you can answer: What should the software do? How should it behave? What are the performance expectations? Are there constraints?
- Introduction — Define the purpose of the software, what it must and must not do, the core problems it solves, who the intended users are, and optionally a high-level overview of the document's structure.
- General Description — Describe the system's overall functionality and environment: user expectations, required hardware, and all relevant interfaces (system, user, hardware, software). Document important assumptions or dependencies.
- Specific Requirements — Break the system into precise inputs, outputs, processes, performance criteria, and integration details. Define both functional and non-functional attributes, including usability, security, availability, and maintainability.
With this outline in place, collaborate with the client to fill in every detail. Get the final version reviewed and approved by all key stakeholders before development begins.
4. Avoid common mistakes
- Don't skip definitions: Include a glossary for industry terms and jargon so readers can interpret the document correctly.
- Don't mix unrelated concepts: Keep information well-organized and grouped logically.
- Don't ignore the end user: Understand who will use the system and how; base requirements on real user workflows.
- Don't be ambiguous: Make requirements specific, measurable, and testable to avoid misinterpretation.
5. Consider a requirements management tool
Requirements management platforms (such as Jama Connect) can simplify SRS creation by tracking decisions, relationships, dependencies, and regulatory requirements throughout the development lifecycle. When selecting a tool, look for:
| Capability | What it gives you |
|---|---|
| Confidence | Clear traceability that highlights potential risk areas. |
| Visibility | Insight into relationships across teams, systems, activities, and results. |
| Speed | Faster alignment and reduced rework through structured tracking. |
| Adaptability | Support for your organization's workflows and processes. |
| Performance Monitoring | Ability to track team performance and measure process improvements. |