What is the minimum number of items to sample from a population for a daily...

HITRUST defines sample sizes for manual controls based on theirfrequency of operation. Fordaily controls, such as system log reviews or daily backup checks, the required sample size is25 items. This sample size is designed to provide sufficient evidence that the control is consistently applied over time while remaining manageable for assessors. For weekly controls, the sample size is smaller (5), and for monthly or quarterly controls, it is smaller still (2 or 1). The 25-item rule ensures daily processes are tested across a meaningful timeframe (roughly a month of working days) to validate reliability. This standardized approach ensures comparability across assessments and prevents under-testing.