How to Write a Software Requirements Document
By ATTPL IT · · 3 min read
Many software projects go over budget or fail to meet expectations because the business and the developers had different ideas about what was being built. A software requirements document — sometimes called a requirements specification — puts those ideas in writing. It does not need to be long or technical; it needs to be clear.
1. Start with goals
Explain why the software is needed and what business problem it solves. Define measurable goals, such as reducing order processing time or eliminating manual spreadsheets. Clear goals help everyone make good decisions when trade-offs arise later.
2. Describe the users
- Who will use the system: staff roles, customers, vendors, managers.
- What each type of user needs to do.
- Their devices, locations and technical comfort.
- Permissions: who can view, edit or approve what.
3. List features as user stories
Describe features in simple language, for example: “As a sales executive, I want to record a customer visit from my phone so that my manager can see daily activity.” Prioritise features as must-have, should-have and nice-to-have. Building the must-haves first reduces risk and cost.
4. Data, integrations and reports
List the main data the system will store, where it comes from and which reports are needed. Identify integrations with existing tools — accounting software, payment gateways, SMS or WhatsApp, HR or CRM systems. Ready-made platforms such as ATTPL CRM or ATTPL WorkforceOS may cover some needs without custom development.
5. Non-functional requirements
- Performance: expected users and response times.
- Security: login methods, data protection and backups.
- Availability: acceptable downtime.
- Compliance: data protection obligations.
- Support and maintenance expectations.
Data protection duties under India’s data protection law should be considered from the start.
6. A simple document outline
- Background and goals.
- Users and roles.
- Features as prioritised user stories.
- Data, reports and integrations.
- Non-functional requirements.
- Assumptions, constraints and open questions.
- Acceptance criteria and sign-off.
Using a consistent outline makes documents easier to review and compare between projects.
7. Working well with developers
Share the document early and invite questions. Developers often spot gaps, risks and simpler alternatives. Prefer short development cycles where working parts of the system are shown regularly, so that misunderstandings are caught early. Nominate one decision-maker on the business side to avoid conflicting instructions.
8. Acceptance testing
Before accepting the software, test it against the requirements using real scenarios and sample data. Record defects clearly, retest fixes and sign off only when must-have features work as agreed. Plan training and data migration as part of acceptance, not as an afterthought.
9. Review, sign-off and change control
Review the document with all stakeholders and the development team, resolve questions and sign off before development starts. Agree a simple change control process, because requirements will evolve. Link payments to milestones and acceptance testing. Contract terms and IP ownership can be reviewed by ATTPL Legal, and ongoing support is explained in our IT support guide.
Frequently asked questions
How long should a requirements document be?
Long enough to be clear; for small projects a few pages with user stories and priorities may be enough.
What are non-functional requirements?
Requirements about how the system performs, such as speed, security, availability and compliance, rather than specific features.
Can requirements change after sign-off?
Yes, through an agreed change control process that assesses impact on cost and timelines.
Who should write the requirements document?
The business owner or a nominated project lead, with input from users and review by the development team.
Sources
Planning a software project for your business? Contact ATTPL IT.
