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Requirements vs Specifications

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Requirements are descriptions of the future. This is a broad term that can include high level ideas for a product, service, experience, building, facility, technology or infrastructure.
Specifications are detailed descriptions of the present or future that can be interpreted without much ambiguity.

The Difference

Requirements may begin as high level ideas that are refined over time to become requirements specifications that are detailed enough to be created by a subject matter expert without much need for interpretation.
The term specifications extends beyond requirements specifications to detailed documentation of non-functional requirements, designs, standards, products, services, processes, methods, interfaces, practices, buildings, facilities, infrastructure, equipment, vehicles, technologies and documentation templates.
Requirements vs Specifications
Descriptions of the future.
Descriptions of the present or future in enough detail to avoid ambiguous interpretation.
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More about requirements:
Community Requirements
Customer Requirement
Functional Requirements
Performance Requirements
Product Functions
Project Requirements
Service Requirements
Stakeholder Requirements
Technology Needs
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The common types of specification.


The common types and formats of requirements.

Functional Requirements

An overview of functional requirements with examples.

Process Requirements

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Design Requirements

A list of what is included in design requirements.

Product Functions

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Business Rules

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System Analysis Examples

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Stakeholder Engagement

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Service Requirements

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Performance Requirements

An overview of performance requirements with examples.

Management Direction

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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

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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

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Business Pain Points

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Business Context

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Operational Analysis

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