An outcome KPI reflects the end result of a process, not just its activity or speed. “New employees passing probation period (%)” best reflects the quality and fit outcome of recruitment—whether hires succeed after joining and meeting performance expectations. “Time to recruit” is a process efficiency KPI (cycle time). “Applications per job requisition” is an input/volume indicator (top-of-funnel). “Job offer acceptance rate” is an intermediate outcome in the recruitment funnel, but it does not confirm that the hires are effective once onboarded. Probation pass rate connects recruitment (selection) to downstream performance and retention risk, making it more outcome-oriented. Measurement challenges include ensuring consistent probation criteria across managers and roles, and avoiding bias or inconsistent standards. Activation should define probation duration, pass/fail rules, exclusions (role changes, layoffs), and segmentation by role family to identify where recruitment quality is strong or weak. This KPI is often balanced with speed measures (time to recruit) to avoid a “slow but perfect” hiring process that harms business needs.