Functional Requirements
Template Structure
1. Requirement Definition
- ID and title
- Description
- Priority and source
- Dependencies
2. Behavioral Specifications
- Detailed behaviors
- Constraints
- Exception cases
3. Traceability
- Related user stories
- Implementation references
- Test cases
Functional Requirement Structure
Basic Format
FR-[XXX]: [Requirement Title]
Description: [Brief description of the requirement]
Details: - [Specific behavior 1] - [Specific behavior 2] - [Specific behavior n]
Priority: [Must have | Should have | Could have | Won’t have]
Source: [Source reference]
Dependent requirements: [List of related requirements]
Verification method: [Testing approach]
Example
FR-103: User Authentication
Description: The system must authenticate users before granting access to protected resources.
Details: - The system shall provide a login interface requiring username and password - The system shall validate credentials against the user database - The system shall enforce password complexity requirements - The system shall lock accounts after 5 failed login attempts - The system shall provide a password recovery mechanism
Priority: Must have
Source: Security policy SP-42
Dependent requirements: FR-101, FR-102
Verification method: Security testing
Implementing Stories: - @story:E01-F01-US01 - New customer account creation - @story:E01-F01-US02 - Password reset flow
Validation Checklist
Before finalizing a functional requirement:
User Story Mapping
Story References
Implemented By: - E01-F01-US01: Account Creation Story - E01-F01-US02: Password Reset Story
Cross-Reference Matrix
| Requirement ID | User Stories | NFRs |
|---|---|---|
| FR-103 | E01-F01-US01, E01-F01-US02 | NFR-201, NFR-202 |