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Functional vs Non-functional Requirements

 , updated on October 14, 2016
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.
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
TypeRequirements
Examples of Functional Requirements Business Rules
Calculations
Process Flows
Use Cases
Examples of Non-Functional RequirementsAccessibility
Architectural Requirements
Information Security Requirements
Compliance & Legal Requirements
Service Management Requirements
Design Requirements
Disaster Recovery Requirements
Performance Requirements
Operational Requirements
Quality Requirements
Related ConceptsBehavioral Requirements

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