What is the Difference Between Verification and Validation?

The main difference between verification and validation lies in their purposes and the stages of the software development process at which they are performed. Here are the key differences between the two:

1. Purpose: Verification ensures that the software meets specific requirements and specifications, while validation checks whether the software meets the requirements and expectations of the user.
2. Stage: Verification is typically performed during the development phase, while validation occurs after product development.
3. Methods: Verification involves checking documents, design, codes, and programs using methods like reviews, walkthroughs, inspections, and desk-checking. Validation, on the other hand, involves testing and validating the actual product using methods like black box testing, white box testing, and non-functional testing.
4. Code Execution: Verification does not involve executing the code, while validation involves executing the code.
5. Responsibility: Verification is usually the responsibility of the development team, while validation is typically the responsibility of an independent testing group.

In summary, verification focuses on ensuring that the software is built according to the specified requirements, while validation ensures that the software meets the user's needs and expectations.

Comparative Table: Verification vs Validation

Here is a table highlighting the differences between verification and validation:

In summary, verification ensures that the software is being built correctly, while validation ensures that the right product is being built.