The X and s chart (also known as the individuals and moving range chart) is specifically designed for time series analysis. It is used to monitor process performance over time by tracking individual data points (X) and their corresponding moving ranges (s). The X and s chart helps identify trends, shifts, and variations in process performance, making it a valuable tool for analyzing time-dependent data. Other tools listed (Pareto chart, scatter diagram, and histogram) are not specifically designed for time series analysis and serve different purposes in quality management1.
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The ASQ Certified Manager of Quality/Organizational Excellence Handbook, Fifth Edition. Sandra L.
Furterer and Douglas C. Wood. Published 2021231

Quality Function Deployment (QFD) is a structured planning process that helps organizations translate customer needs and requirements into specific product or service characteristics. It is used to ensure that the design and development process aligns with customer expectations and strategic goals. QFD involves cross-functional teams working together to prioritize features, identify critical design elements, and create a matrix that links customer requirements to technical specifications. By emphasizing planning and early-stage decision-making, QFD aims to prevent defects and improve overall quality.
References: 1: ASQ Certified Manager of Quality/Organizational Excellence

Building strong and lasting relationships with suppliers involves effective communication and collaboration.
Regular meetings provide an opportunity for both parties to discuss plans, address challenges, and find solutions together. By engaging in open dialogue, the customer can foster trust and mutual understanding, leading to better long-term relations. While other actions such as developing clear purchase orders, training purchasing staff, and creating opportunities for quality engineers are important, regular meetings directly contribute to ongoing cooperation and problem-solving1.
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ASQ Certified Manager of Quality/Organizational Excellence
CMQ/OE Excellence Certified Manager of Quality/Organizational - ASQ
QASEC - ASQ CMQ/OE, Manager of Quality Organizational Excellence Canada