The document discusses key metrics for a customer call center including critical-to-quality (CTQ) factors, specifications, and potential defects. The main CTQs are responsiveness of operators and efficiency of employees. Specifications include providing a 24-hour service and operators working in shifts. Some potential defects that could occur are services being unavailable, no operator available to take a call, operators being on leave, and calls being kept on hold or customers waiting a long time to speak to someone.