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Functional vs Non-functional Requirements

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Functional requirements are specifications of business needs such as business rules, process flows and calculations. In many cases, the term functional requirements is used to denote all requirements that are considered business driven including behavioral specifications.
Non-functional requirements capture anything not in the functional requirements including things such as operational characteristics, architecture, technical specifications and design.

Differs By Industry

The line between functional and non-functional requirements varies by industry and business. For example, design may be considered functional requirements by some industries but is more typically considered non-functional.
Overview: Functional Vs Nonfunctional Requirements
Type
Requirements
Examples of Functional Requirements
Business Rules
Calculations
Process Flows
Use Cases
Examples of Non-Functional Requirements
Accessibility
Architectural Requirements
Information Security Requirements
Compliance & Legal Requirements
Service Management Requirements
Design Requirements
Disaster Recovery Requirements
Performance Requirements
Operational Requirements
Quality Requirements
Related Concepts
Behavioral Requirements
Next: Non-functional Requirements
More about requirements:
Community Requirements
Customer Requirement
Functional Requirements
Performance Requirements
Product Functions
Project Requirements
Requirements
Scope
Service Requirements
Stakeholder Requirements
Stakeholders
Technology Needs
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Requirements

The common types and formats of requirements.

Functional Requirements

An overview of functional requirements with examples.

Process Requirements

Common examples of process requirements.

Design Requirements

A list of what is included in design requirements.

Product Functions

The definition of product function with examples.

Business Rules

The definition of business rule with a list of examples.

System Analysis Examples

An overview of system analysis with examples.

Stakeholder Engagement

An overview of the stakeholder engagement process with examples.

Service Requirements

An overview of service requirements with examples.

Performance Requirements

An overview of performance requirements with examples.

Management Direction

An overview of management direction with examples.

Technology Needs

An overview of technology needs with examples.

Stakeholder Requirements

Common examples of stakeholder requirements.

Business Analysis

A list of business analysis techniques and deliverables.

Business Quality

An overview of business quality with examples.

Words To Describe Analysis

A vocabulary for describing analysis.

Business Results

A list of common types of business result.

Team Analysis

An overview of team analysis with examples.

Business Planning

An overview of the different types of business planning.

Service Analysis

An overview of service analysis with examples.

Impact Analysis

An overview of impact analysis with examples.

Quality Analysis

An overview of quality analysis with examples.

Business Pain Points

An overview of business pain points with examples.

Business Context

An overview of business context with examples.

Operational Analysis

An overview of operational analysis with examples.

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