After completing the first year of his security awareness program, Sakis reviews the data about how many staff completed training compared to how many were assigned the training to determine whether he hit the 95% completion rate he was aiming for. What is this type of measure called?

Sakis is tracking a key performance indicator (KPI). A KPI is used to measure performance (and success). Without a definition of success, this would simply be a metric, but Sakis is working toward a known goal and can measure against it. There is not a return investment calculation in this problem, and the measure is not a control.