A KPI is a way to internally and empirically measure the performance of your Agreement (including your performance and that of your Co-Party(ies)).  Typical measurement types include Spend, Cost, Quality, Delivery, Innovation, Risk, Solutions, Realization of Benefits, Compliance, Cultural Alignment, and Maintenance & Support Services.  Measurements are captured via surveys taken by selected participants and then tracked and charted against a set target.  You can additionally track financial, numeric and/or emotional and other impacts.