QFD, short for Quality Function Deployment, is used in quality management and Design for Six Sigma (DFSS) for planning and developing high-quality products that meet customer requirements. QFD consists of four consecutive phases, during which a House of Quality (HoQ) is created with the customer to develop specific product elements – CTQs (Critical to Quality), system functions, design elements, and the production process. The most important factors are selected through prioritization. The customer requirements for a quality product, identified in Phase 1, serve as the foundation for the CTQs and are consistently applied throughout the entire process.