Verification Vs Validation (original) (raw)

Last Updated : 16 May, 2026

Verification and Validation are two important concepts in software testing used to ensure software quality. Both help in delivering a correct and reliable product, but they differ in approach and purpose. Verification focuses on checking processes, while validation focuses on checking the final product.

Both are part of quality assurance and testing process
Help ensure software correctness and reliability
Used at different stages of development

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Verification Vs Validation

Verification

Verification is the process of evaluating work products to ensure they meet specified requirements. It checks whether the software is being developed correctly according to design and standards.

Focuses on process and documentation
Done without executing the code (static testing)
Includes reviews, inspections, and walkthroughs

**Example: Reviewing requirement and design documents of a banking app to ensure all features are correctly planned before development.

Validation

Validation is the process of evaluating the final product to ensure it meets user needs and expectations. It checks whether the right product has been built.

Focuses on final product behavior
Done by executing the code (dynamic testing)
Includes system testing, user acceptance testing

**Example: Testing a banking app to verify if users can successfully log in, transfer money, and view transactions.

Verification vs Validation

Features	Verification	Validation
Definition	Ensures work products conform to specified requirements	Ensures the final product meets user and stakeholder needs
Focus	Requirements, design, and implementation correctness	Functional behavior and intended use
Nature	Often analytical and review-based	Typically evaluation- and execution-based
Execution	May or may not involve executing software	Usually involves executing the software
Methods Used	Methods used in verification are reviews, walkthroughs, inspections and desk-checking.	Functional testing, system testing, acceptance testing
Purpose	It checks whether the software conforms to specifications or not.	It checks whether the software meets the requirements and expectations of a customer or not.
Bug	Helps detect defects early by checking conformance to requirements and standards.	Detects defects during execution, including functional, usability, and integration issues.
Goal	The goal of verification is application and software architecture and specification.	The goal of validation is an actual product.
Responsibility	Involves developers, reviewers, QA, and engineers	Involves testers, users, QA teams, and stakeholders.
Timing	Performed throughout the software development lifecycle.	Performed throughout the lifecycle when the system or components are executable.
Lifecycle	Applied continuously across all lifecycle phases.	Applied iteratively as the system evolves and becomes usable.
Error Focus	Verification is for prevention of errors.	Validation is for detection of errors.
Stability	Based on defined criteria, standards, and expert judgment.	Based on observed system behavior and acceptance criteria.