How to write SRS?
A Software Requirements Specification (SRS) is a comprehensive description of the intended purpose and environment for software under development. The SRS fully describes what the software will do and how it will be expected to perform. It’s a critical aspect of the software development lifecycle that aids in minimizing the risk of project failures.
Here are the steps you can follow to write an SRS:
- Introduction: This section introduces the system and the purpose of the SRS document. It typically includes:
- Purpose: The goals of the SRS.
- Scope: What the product will do and its benefits.
- Definitions, Acronyms, and Abbreviations: Any specific terms that people outside the development team might not understand.
- References: Any documents or resources that provide additional context.
- Overview: A brief overview of the full content of the SRS.
- Overall Description: This section should give a broad view of the entire system. It includes:
- Product perspective: How the system fits into larger systems or business processes.
- Product features: A summary of the major functions the system will perform.
- User classes and characteristics: The types of users who will interact with the system and their needs.
- Operating environment: The hardware and software the system will run on.
- Design and implementation constraints: Any restrictions or limitations that might impact the design or implementation of the system.
- System Features: This section is the heart of the SRS, where you detail the system’s features. For each feature, include:
- Description and priority: A brief description of the feature and its importance.
- Stimulus/response sequences: How the system should respond to specific inputs or actions.
- Functional requirements: The details of what the feature must do.
- External Interface Requirements: This section describes all the inputs and outputs related to the system, including user, hardware, software, and communication interfaces.
- System Requirements: This section describes the system’s functional (what the system should do) and non-functional requirements (performance, reliability, security, etc.).
- Other Requirements: If there are other requirements that don’t fit into the categories above, include them in this section.
- Use Case Diagrams and Scenarios: These diagrams and scenarios describe how different types of users interact with the system to accomplish specific tasks.
- Glossary: Any terms that need clarification should be defined in this section.
- Appendices: Include any supplementary information here.
Remember, clarity and precision are key when writing an SRS to avoid any confusion or misinterpretation. This document will guide the developers, so it should be as clear and complete as possible. Also, it should be noted that the SRS document is often referred to during the lifecycle of a project, and hence it should be kept updated as the system evolves.