Requirements

What is a Requirement?

The requirements are the high-level descriptions about a particular system services, constraints or to a detailed specification that are generated during the requirements gathering process.

Requirement Types:

• User Requirements - It is a detailed description in natural language along with diagrams of the services the system provides and its operational constraints. It is usually developed by end users.

• System requirements - It is a structured document detailing the descriptions of the system's functions, services and operational constraints.

• Functional Requirements - It describes the services of the system, how the system should react to particular inputs and how the system should behave in definite situations.

• Non-functional Requirements - It describes the attributes of the system.

• Domain Requirements - Requirements that arises from the domain of the application and that reflect characteristics of that domain. It can be either functional or non-functional specifications.

Requirement Document Structure:

• Preface

• Introduction

• User requirements definition

• System architecture

• System requirements specification

• System models

• Appendix