Key performance indicators (KPIs) are important metrics for quality assurance that can help monitor performance and drive desired business results. Effective KPIs include the percentage of defects, number of customer complaints, levels of customer satisfaction, and on-time delivery rates. Tracking these types of quality indicators regularly provides information for decision making, helps plan appropriately, produces improvements, and ensures rapid response to critical issues. The goal is to improve service quality and make better use of resources.