Objective of performing Concurrent and Prospective validations is different. Prospective validation is performed when a new product, new formula is to be launched for the first time or faciltity is new. While concurrent validation is performed when product is being currently manufactured, there is a good process knowledge and only minor / few changes are to be executed in the revised process.
Therefore, based on these objctives you have to decide what type of PV is to be carried out. Please remember that you can not release the PV batches untill PV is completed and data is reviewed by QA and approved if found satisfactory. While in concurrent PV individual PV batches can be released for sale if those meet finished product specification and manufacturing process is found satisfactory.
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