• Yamaguchi operates a quality management system according to ISO 9001:2015.
• Perform IQC, IPQC, and OQC processes including defined sampling frequency and sampling plan.
• Work instructions for all operation and testing processes are available and put in process.
• 4M Change Analysis and Statistical techniques e.g. Pareto diagram, fishbone diagram, and control chart,… are applied to quality issue analysis and quality improvement.
• Implement PFMEA and PPAP. Key characteristics are identified in the control plan and are derived from FMEA.
• Apply process capability studies (Cp/ Cpk) and control chart to critical machining/ assembly/ testing process.
• A system to monitor the correct revision of drawings, change notices, and specifications is in use.
• A first in – first out (FIFO) system is utilized.