Software Requirements Specification (SRS)

1. Introduction

1.1 Purpose

Describe the purpose of this document and the intended audience.
Explain what the system will do and why this SRS exists.

1.2 Document Conventions

Describe formatting conventions used in this document (e.g., requirement identifiers, terminology, priority levels, notation).

1.3 Project Scope

Provide a high-level description of the system, its goals, and the business objectives it supports.

1.4 References

List documents, standards, or resources referenced in this document.

2. Overall Description

2.1 Product Perspective

Describe how the system fits within the larger system landscape.
Explain whether it is a new system, replacement system, or subsystem of a larger system.

2.2 User Classes and Characteristics

Describe the different user groups that interact with the system and their characteristics.

2.3 Operating Environment

Describe the environment in which the system will operate.

Examples include:

• Operating systems
• Hardware platforms
• Browsers
• Databases
• Network environment

2.4 Design and Implementation Constraints

Describe any constraints affecting system design and implementation.

Examples:

• Regulatory requirements
• Technology stack constraints
• Integration requirements
• Hardware limitations

2.5 Assumptions and Dependencies

Describe assumptions made during requirements analysis and external dependencies.

Examples:

• Availability of external APIs
• Expected user behavior
• Dependencies on other systems

3. System Features

3.X System Feature Name

3.X.1 Description

Provide a general description of this system feature and its purpose.

3.X.2 Functional Requirements

4. Data Requirements

4.1 Logical Data Model

Describe the logical structure of the system’s data.
Include diagrams if necessary (e.g., ER diagrams).

4.2 Data Dictionary

4.3 Reports

Describe system-generated reports.

4.4 Data Acquisition, Integrity, Retention, and Disposal

Describe how data is collected, validated, stored, retained, and deleted.

5. External Interface Requirements

5.1 User Interfaces

Describe the user interface requirements.

Examples:

• Web interface
• Mobile interface
• Dashboard layouts

5.2 Software Interfaces

Describe interfaces with external software systems.

Examples:

• APIs
• Databases
• Third-party services

5.3 Hardware Interfaces

Describe interactions with hardware devices.

Examples:

• Sensors
• IoT devices
• Specialized hardware

5.4 Communications Interfaces

Describe communication protocols and network requirements.

Examples:

• HTTP / HTTPS
• REST APIs
• Message queues
• Network protocols

6. Quality Attributes

6.1 Usability

Describe usability requirements such as ease of use, accessibility, and learnability.

6.2 Performance

Describe performance requirements such as response time, throughput, and scalability.

6.3 Security

Describe authentication, authorization, data protection, and privacy requirements.

6.4 Safety

Describe safety-related requirements where system failure may cause harm.

6.X Other Quality Attributes

Examples:

• Reliability
• Maintainability
• Availability
• Scalability

7. Internationalization and Localization Requirements

Describe requirements related to language support, regional formats, and localization needs.

Examples:

• Multi-language support
• Time and date formats
• Currency formats

8. Other Requirements

Describe any additional requirements not covered in previous sections.

Examples:

• Legal requirements
• Compliance standards
• Logging and monitoring

Appendix A: Glossary

Appendix B: Analysis Models

Context Diagram

Include a diagram illustrating the system and its external entities.

Use Case Diagram

Include a diagram representing system use cases and user interactions.

Additional analysis models may include:

• Sequence diagrams
• Activity diagrams
• State diagrams