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GAMP 4 introduced a categorization system for software to determine the level of validation effort required. This was a precursor to modern risk-based categorization:

Although GAMP 4 is now obsolete, its core philosophy—risk-based, lifecycle validation—remains intact in . The shift to GAMP 5 brought greater flexibility for evolving technologies (e.g., AI, blockchain, SaaS) and aligned with ICH Q8–Q10 (Quality by Design, Quality Systems). Nevertheless, many long-standing industry professionals still reference GAMP 4 concepts when understanding validation fundamentals.

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While GAMP 5 is famous for its explicit risk-based approach, GAMP 4 introduced the concept of "Risk Assessment" as a tool to determine the extent of validation. It utilized a matrix to match system criticality against system complexity (Novelty/Complexity/Impact) to decide how much documentation and testing were necessary.