Performing user acceptance testing (UAT) is the most important activity before implementing a new system, as it ensures that the system meets the user requirements and expectations, and that it is free of major defects. Documenting last-minute enhancements, performing a pre-implementation audit, and ensuring that code has been reviewed are also important activities, but they arenot as critical as UAT. References: CISA Review Manual (Digital Version), Chapter 4, Section 4.2.2
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