Topic 3: Software Requirements Specification (SRS)
Definition
The Software Requirements Specification (SRS) is a detailed document that outlines the functional and
non-functional requirements of a software system. It serves as a formal agreement between stakeholders and
developers, ensuring a clear understanding of the system's intended functionality and constraints.
Structure of an SRS Document
1. Introduction
- Purpose: Clarifies the objectives of the SRS.
- Scope: Defines the boundaries of the software system.
- Definitions, Acronyms, and Abbreviations
- References
- Overview
2. Overall Description
- Product Perspective
- Product Functions
- User Characteristics
- Constraints
- Assumptions and Dependencies
3. Specific Requirements
- Functional Requirements
- Non-Functional Requirements
- External Interface Requirements
4. Appendices
- Additional supporting information like diagrams or UI mockups.
Functional vs. Non-Functional Requirements
Topic 3: Software Requirements Specification (SRS)
Functional Requirements: What the system should do.
Example: 'The system shall allow users to log in using a username and password.'
Non-Functional Requirements: How the system performs certain functions.
Example: 'The system shall respond to user inputs within 2 seconds.'
Visual Representations
Use Case Diagram:
User interacts with system functionalities such as:
- Authenticate
- View Dashboard
- Generate Report
Data Flow Diagram:
User --> Login Process --> Authentication System --> Access Granted
Importance of SRS
- Provides clarity for stakeholders
- Acts as a reference for development and testing
- Assists in project planning
- Serves as an agreement between clients and developers
Best Practices
- Ensure consistency and completeness
- Make requirements verifiable and modifiable
- Maintain traceability of each requirement