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Quality Control, Total Quality Management, and Quality Standards Prepared by: Ralph Dorsainvil
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Quality Control Statistical Process Control Control chart zone rules –8 rules
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Statistical Process Control Control Charts –X bar – average level chart –P – fraction defective –C chart - # of defects per sample –U chart - # of defects per unit (more than one type of defect per subgroup) –R chart - ranges
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X chart
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P chart
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Zones on a Control Chart
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Zone Rules Test 1: Extreme Points Test 2: Two Out of Three Points in Zone A or Beyond (X bar only) Test 3: Four out of Five Points in Zone B or Beyond (X bar only) Test 4: Runs Above or Below the Centerline
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Zone Rules (cont’d) Test 5: Linear Trend Identification Test 6: Oscillatory Trend Identification Test 7: Avoidance of Zone C Test (X bar only) Test 8: Run in Zone C Test (X bar only)
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Examples
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Total Quality Management Deming Ishikawa Taguchi Juran Tools Used
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Ishikawa
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Taguchi Loss Function
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Juran Quality Trilogy –Quality planning Identify customers and needs –Quality Control –Quality improvement
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Tools Used 7 Basic Tools –Histograms –Check Sheets –Pareto Diagrams –Graphs –Scatter Diagrams –Cause-and-effect diagrams –Control Charts
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Pareto Diagram
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Scatter Diagram
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Quality Standards ISO Standards Kano models Blue Bird examples (pg.85-103)
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ISO Standards ISO 9000 and alternatives –9001 – quality assurance in design/development, production, installation and servicing –9002 – quality assurance in production, installation and servicing –9003 – quality assurance in final inspection and test
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ISO 14000 –Environmental standards Registration Audits –Internal –External Why? –Customer Pressure –Competitive advantage –Improved internal operations
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Kano Model By Noriako Kano Better customer communication/Feedback 3 classes: Basic, Linear, & Delighter Requirements
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Kano Model
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Conclusion Quality Control, Total Quality Management, and Quality Standards are related Many more tools are used
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Acknowledgements Berger, Roger W., The Certified quality engineer handbook Besterfield, Dale H., Total quality management 2 nd ed. Devor, Richard E., Statistical quality design and control Peach, Robert W., The ISO 9000 handbook 3 rd ed. Rao, Ashok., Total quality management: a cross functional perspective www.ISO.org www.qualityamerica.com www.spcforexcel.com
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