What is the difference between validation and verification in testing?

The terms "verification" and "validation" are commonly used in software engineering, but the terms refer to two different types of analysis.

What is the difference between validation and verification in testing

Validation

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Validation is the process of evaluating a system or component during or at the end of the development process to determine whether it satisfies the specified requirements.

It is concerned with ensuring that the product meets the user's needs and expectations. Validation answers the question, "Are we building the right product?"

Activities:
- Involves actual testing and evaluation of the end product.
- Ensures that the software fulfills the intended purpose and is aligned with user requirements.
Examples:
- User acceptance testing (UAT) where the system is tested against user requirements.
- Ensuring that the system satisfies business and functional requirements.

Verification

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Verification is the process of evaluating work products (e.g., documents, code) during the development process to ensure that they meet the specified requirements.

It is concerned with checking if the product is being built correctly. Verification answers the question, "Are we building the product right?"

Activities:
- Involves reviews, inspections, and walkthroughs to check work products for correctness.
- It does not involve actual execution or testing of the end product.
Examples:
- Code reviews to ensure that the code adheres to coding standards.
- Requirement reviews to confirm that requirements are clear, complete, and consistent.

Aspect	Validation	Verification
Definition	Process of evaluating the end product to ensure it meets user requirements.	Process of evaluating work products during development to ensure they meet specified requirements.
Focus	Determines whether the product meets user needs and expectations.	Checks if the product is being built correctly and adheres to requirements.
Activities	Actual testing and evaluation of the end product.	Reviews, inspections, and walkthroughs to check work products for correctness.
Examples	User acceptance testing (UAT), ensuring the system satisfies business and functional requirements.	Code reviews, requirement reviews, ensuring adherence to coding standards.

This table summarizes the key differences between validation and verification, providing a quick reference for understanding their distinct roles in the software testing process.

Summary

Validation is about evaluating the end product against user needs and requirements. It involves actual testing and focuses on the final product's behavior.
Verification is about checking the work products during development to ensure they meet specified requirements. It involves reviews and inspections and focuses on the correctness of the development process.