A company’s performance management system either hinders or enhances high performance in an organization. The way in which managers assess individual performance and the role of HR business partners in the year end performance review process says a lot about an organization’s maturity when it comes to creating and sustaining a high performance culture. High performance cultures differentially reward their top performers; but this requires high performance distributions. Arriving at such distributions requires a robust performance rating calibration dialogue among managers. This is where HR business partners can play a major role in both implementing the process but also facilitating the performance calibration meetings to surface the differentiating behaviors and results that distinguishes top performers from everyone else.