Validation is a prospective and confirmatory exercise.

The difference between qualification and validation is that equipment is individually qualified, and the system or process is validated.

In this sense, qualification is part of validation

ISPE Baseline® Guide defines “commissioning” as:

”A well planned, documented, and managed engineering approach to the start-up and turnover of facilities, systems, and equipment to the End-User that results in a safe and functional environment that meets established design requirements and stakeholder expectations.”

For more info :

https://drive.google.com/file/d/1NoK1NlE8mxlCi6oCgFe5rc09Fdnx-ZZw/view?usp=sharing