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Requirements Guide

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Requirements are documentation of a need, expectation, target, condition or necessity that can be used to develop or improve products, services, processes, capabilities or environments. It is common for requirements gathering to begin with high level needs and expectations and progress to detailed specifications that can be used for implementation, testing and quality control.

Types

Requirements may be collected from stakeholders such as business units, customers, communities, users and subject matter experts in various areas. The following are common types of requirements.
Behavioral Requirements
Business Requirements
Business Requirements Document
Customer Requirements
Examples of Customer Requirements
Functional Requirements
Information Requirements
Needs Analysis
Non-Functional Requirements
Performance Requirements
Product Functions
Product Requirements
Quality Requirements
Stakeholder Requirements
Technical Requirements
Usability Requirements

Formats

Requirements range from high-level statements of expectations to detailed specifications. The following are common formats for capturing requirements.
Acceptance Criteria
Business Rules
Specifications
Use Cases
User Story
Voice Of The Customer

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Citation

John Spacey. "Requirements Guide." Simplicable. Retrieved June 21, 2026. from https://simplicable.com/new/requirements

Customer Requirements

The common types of customer requirements.

Functional Requirements

An overview of functional requirements with examples.

Non-Functional Requirements

A few examples of non-functional requirements.

Requirements Management

A definition of requirements management with examples.

Requirements vs Specifications

The difference between requirements and specifications.

Stakeholder Requirements

Common examples of stakeholder requirements.

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