One of the most important phases of project management is known as validation. The process of validation generally occurs as one step or multiple steps of the process, usually in stages and is used to determine if the project is meeting specifications. The specifications of the project are highly detailed, and it is up to the project manger to evaluate the validation process to be sure the project is meeting the requirements. Experience in project management can assist supervisors in evaluating the different phases and steps of validation. Where validation is the technique to evaluate the stages of the project, verfication is the proof of compliance made by the project manager. This proof can be in the form of certification, or can be as simple as different area supervisors signing off on the phase of the project. Validation may be a complicated series of tests and controls, where verification is ensuring that those tests produced the expected results. A Project Manager monitors the results through the process and compares them to the stage of the project. The procedure of validation and verification helps advance the project and measures progress.
This term is defined in the 3rd and the 4th edition of the PMBOK.