# Requirements Document Template

## Introduction

[PROJECT NAME] is a [SYSTEM TYPE] designed for [TARGET USERS]. The system [PRIMARY PURPOSE].

## System Context

### Architectural Overview
- **Components:** [List major system components]
- **Data Flow:** [High-level data movement]
- **Integration Points:** [External systems/APIs]
- **Deployment Model:** [Cloud/On-premise/Hybrid]

## Glossary

- **[Term]**: [Definition specific to this system]
- **Component**: Major system module or service
- **Integration Point**: Connection to external system or API

## Functional Requirements

### REQ-1: [Feature Name]

**User Story:** As a [user role], I want [feature], so that [benefit]

**Acceptance Criteria:**
1. WHEN [condition], THE system SHALL [behavior]
2. THE system SHALL [requirement] within [time constraint]
3. IF [error condition], THEN THE system SHALL [error handling]

**Components Involved:** [COMP-1, COMP-2]
**Data Flow:** [How data moves for this requirement]

### REQ-2: [Feature Name]

**User Story:** As a [user role], I want [feature], so that [benefit]

**Acceptance Criteria:**
1. WHEN [condition], THE system SHALL [behavior]
2. WHERE [context], THE system SHALL [behavior]
3. THE system SHALL persist [data] with [attributes]

**Components Involved:** [COMP-3, COMP-4]
**Integration Points:** [External systems used]

## Non-Functional Requirements

### Performance Requirements
- Response time: THE system SHALL respond to user requests within [X] milliseconds
- Throughput: THE system SHALL handle [X] concurrent users
- Data processing: THE system SHALL process [X] records per second

### Security Requirements  
- Authentication: THE system SHALL implement [auth method]
- Authorization: THE system SHALL enforce role-based access control
- Data protection: THE system SHALL encrypt sensitive data at rest and in transit

### Reliability Requirements
- Availability: THE system SHALL maintain 99.9% uptime
- Recovery: THE system SHALL recover from failures within [X] minutes
- Data integrity: THE system SHALL ensure ACID compliance for transactions

### Scalability Requirements
- THE system SHALL support horizontal scaling
- THE system SHALL handle [X]% growth in users annually
- THE system SHALL support database sharding for data volumes exceeding [X]

## Constraints and Boundaries

### Technical Constraints
- Technology: [Programming languages, frameworks, databases]
- Infrastructure: [Cloud provider, hardware limitations]

### Business Constraints
- Budget: [Cost limitations]
- Timeline: [Delivery deadlines]
- Compliance: [Regulatory requirements]

### Scope Boundaries
- **In Scope:** [What's included]
- **Out of Scope:** [What's explicitly excluded]
- **Future Considerations:** [Deferred features]