• Voice-of-the-customer drives QFD by translating consumer needs into design attributes through the house of quality, with iterative updates and cross-functional linkages guiding product realization. Evidence: [2], [9], [20], [12], [3], [6].

• Cross-functional integration and effective communication among marketing, engineering, and manufacturing emerge as critical to successful QFD deployment and product development. Evidence: [5], [6], [4], [8].

• QFD/TQM adoption patterns and outcomes across US, UK, Japan, and other contexts reveal benefits, organizational barriers, and performance implications. Evidence: [8], [18], [16], [15], [10], [17].

• Structured prioritization and planning for QFD design requirements via deployment normalization and decision models demonstrate systematic approaches to resource allocation. Evidence: [12], [3], [20].

• Dynamic QFD extends traditional house-of-quality concepts by incorporating feedback loops and tying evolving customer requirements to process control and quality management systems. Evidence: [20], [19], [16].