What is a sampling plan decision rule?

• A. Guidelines to determine when to terminate sampling and how to use results to decide compliance
• B. Calibration procedures for instruments
• C. Who collects the samples
• D. The budget for the sampling project

Answer: (A)

A sampling plan decision rule is the pre-set guideline that tells you when to stop collecting samples and how to use the results to decide whether exposure is compliant with the required limit. It ties the data you gather directly to a clear decision, so the sampling effort ends consistently and the outcome is auditable. In practice, you define a stopping condition (for example, a fixed number of samples or a rule based on observed results) and a decision criterion (such as all results being below the limit or statistical confidence that the true exposure is below the limit). This ensures actions are based on defined data interpretation rather than ad hoc judgment. Calibration procedures, who collects samples, and the project budget address different parts of the program and do not specify how and when to terminate sampling or how to decide compliance from the results.