This document discusses measuring the effectiveness of a call center through key performance indicators. It identifies important measures in several categories: financial (actual vs. budget costs), service (service level agreements, call abandonment rates), productivity (calls handled per agent), people (absenteeism, staff churn), and customer satisfaction (customer recommendations, satisfaction surveys). Comparing performance over time and to benchmarks is important for continuous improvement. The focus should be on delivering world-class service by understanding customer needs and expectations.