Work out control effectiveness score instantly with clear inputs, formula shown and shareable results.
A simple pass rate treats a partially effective control as a failure and a critical control failure as equal to a trivial one. Weighting partial results at half credit and deducting for critical failures produces a score that moves when it should: three critical failures pull the environment out of the strong band even when the raw pass rate looks healthy.
Weighted effectiveness
score = (effective + 0.5 x partial) / tested x 100 - 5 x critical failures, floored at 0
Yes. A well-designed control that is not operating is still a failure, but the remediation is entirely different from redesigning a flawed control.
It depends on control frequency. Common audit guidance is 25 to 60 samples for daily controls and full population testing for annual ones.