Requirements Engineering

Guide for creating comprehensive Product Requirements Documents (PRDs) that translate business needs into actionable technical specifications with measurable outcomes.

When to Use This Skill

Activate when:

• Creating PRDs for new features or products
• Defining functional and non-functional requirements
• Establishing success criteria and KPIs
• Planning implementation phases and milestones
• Documenting user stories and acceptance criteria
• Conducting requirements analysis and gathering

PRD Development Process

Phase 1: Discovery and Analysis

1. Understand business context and objectives
2. Identify target users and stakeholder needs
3. Analyze existing systems and constraints
4. Define project scope and boundaries

Phase 2: Requirements Definition

1. Create detailed functional requirements
2. Define non-functional requirements (performance, security, scalability)
3. Establish user experience requirements
4. Specify integration and compatibility needs

Phase 3: Success Criteria and Metrics

1. Establish measurable success criteria
2. Define key performance indicators (KPIs)
3. Create acceptance criteria for each requirement
4. Specify testing and validation requirements

Phase 4: Implementation Planning

1. Break down requirements into deliverable phases
2. Identify dependencies and critical path
3. Define milestones and checkpoints
4. Create risk mitigation strategies

Functional Requirements Format

### FR-001: [Requirement Title]
**Priority**: High/Medium/Low
**Description**: Detailed description of what the system must do
**User Story**: As a [user type], I want [functionality] so that [benefit]
**Acceptance Criteria**:
- [ ] Specific, testable criterion 1
- [ ] Specific, testable criterion 2
**Dependencies**: Related requirements or external dependencies

Non-Functional Requirements Format

### NFR-001: [Requirement Title]
**Category**: Performance/Security/Scalability/Usability/Reliability
**Description**: Specific non-functional requirement
**Measurement**: How success will be measured
**Acceptance Criteria**:
- [ ] Quantifiable criterion (e.g., response time < 200ms)
**Testing Method**: How this will be validated

Success Metrics Format

### Success Metric: [Metric Name]
**Objective**: What this metric measures
**Current Baseline**: Starting point
**Target**: Specific goal
**Measurement Method**: How and when to measure
**Definition of Success**: Criteria for meeting the goal

PRD Types

Feature PRD

• Problem statement and user needs
• Detailed functional requirements
• User stories with acceptance criteria
• Technical specifications
• Success metrics and KPIs

Enhancement PRD

• Current state analysis
• Improvement objectives
• Migration/transition strategy
• Performance improvement metrics

Integration PRD

• Systems integration overview
• Data flow requirements
• API specifications
• Error handling and recovery

Migration PRD

• Current system assessment
• Migration objectives and scope
• Cutover strategy and timeline
• Risk mitigation and rollback plans

Key Principles

• Business-First: Start with business objectives, derive technical requirements
• Measurable Outcomes: Every requirement should have clear success criteria
• User-Centric: Focus on user value and experience outcomes
• Risk-Aware: Identify and plan for potential challenges
• Iterative Planning: Structure requirements for phased delivery
• Cross-Functional: Consider technical, UX, business, and compliance aspects