To address staffing timeliness, the PMO should monitor the average recruitment time (B) and the percentage of roles filled within the agreed deadlines (E). PMI-PMOCP stresses these metrics as direct indicators of staffing service performance and customer satisfaction related to timeliness. Other KPIs like NPS (A) or retention (D) provide additional insight but are less relevant to staffing cycle time issues. Reference:PMI-PMOCP Study Guide, Chapter on PMO Service Performance Measurement.