OPS.10:4.4 - Test variability and the proposed change

Compare the current arrangement with the smallest material alternatives: demand/admission changes, timing, usable access, skill coverage, batch/setup changes, pooling or segregation, reserve, recovery and capacity acquisition.

Keep the result and service criterion fixed. Inspect arrival patterns as well as total demand, service and recovery variation as well as average duration, and common-cause losses as well as independent failures. Test the plausible adverse conditions that can reverse the choice.

A batching change may reduce setup time while delaying the first result or defect feedback. A pooled resource may improve a mean while changing a tail or protected class. A reserve must name the disturbance and capability it covers. A proposed schedule must not claim improvement by moving waiting outside the measured start boundary.

Use C.11.CRC for the finite comparison of consequences, resource cost, transition, reversibility and affected options. Keep a recommendation, provision of the resource, authority to use it and the resulting performance separate.