The following documents are the most common types of validation plan documents:
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SVMP – Site Validation Master Plan
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VMP – Validation Master Plan
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VP – Validation Plan
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VPP – Validation Project Plan
So what’s the difference between these 4 documents, why are they sometimes (apparently) used interchangeably? I will try to explain this in an Easy to Understand format. The question is whether this should be a top-down or bottom-up approach.
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http://www.askaboutvalidation.com/types-of-validation-plans/
to read the entire article.