Difference between Verification and Validation .

Differnce between Verification and Validation .

Verification	Validation
Are we building the system right?	Are we building the right system?
Verification is the process of evaluating products of a development phase to find out whether they meet the specified requirements .	Validation is the process of evaluating software at the end of the development process to determine whether software meets the customer expectations and requirements .
The objective of Verification is to make sure that the product being develop is as per the requirements and design specifications .	The objective of Validation is to make sure that the product actually meet up the user’s requirements, and check whether the specifications were correct in the first place .
Following activities are involved in Verification: Reviews, Meetings and Inspections .	Following activities are involved in Validation: Testing like black box testing, white box testing, gray box testing etc .
Verification is carried out by QA team to check whether implementation software is as per specification document or not .	Validation is carried out by testing team .
Execution of code is not comes under Verification .	Execution of code is comes under Validation .
Verification process explains whether the outputs are according to inputs or not .	Validation process describes whether the software is accepted by the user or not .
Verification is carried out before the Validation .	Validation activity is carried out just after the Verification .
Following items are evaluated during Verification: Plans, Requirement Specifications, Design Specifications, Code, Test Cases etc .	Following item is evaluated during Validation: Actual product or Software under test .
Cost of errors caught in Verification is less than errors found in Validation.	Cost of errors caught in Validation is more than errors found in Verification .
It is basically manually checking the of documents and files like requirement specifications etc .	It is basically checking of developed program based on the requirement specifications documents and files .