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The Scientific Method and Quality Improvement. OCMA 2006 tom.sutton@mohawkcollege.ca. Continuous Improvement. Ideas. Seven Statistical Tools. Check sheet Pareto chart Cause and effect diagram Histogram Scatter plot Stratification Graphs (control charts). Problem.

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## The Scientific Method and Quality Improvement

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**The Scientific Method and Quality Improvement**OCMA 2006 tom.sutton@mohawkcollege.ca**Seven Statistical Tools**• Check sheet • Pareto chart • Cause and effect diagram • Histogram • Scatter plot • Stratification • Graphs (control charts)**Problem**• 75 defective springs in a week’s production • Check sheet with defect type • Display on a Pareto chart • Identify the important problem • Focus on the “vital few” not the “trivial many”**DESIGN**Ideas**RUN**DESIGN Ideas**RUN**DESIGN ANALYZE Ideas**RUN**DESIGN ANALYZE Ideas**RUN**DESIGN ANALYZE Ideas More Ideas KNOWLEDGE**99% Quality Level**• 20,000 lost mail articles per hour • Unsafe drinking water 15 minutes /day • 5000 incorrect surgical operations per week • 2 short or long landings at major airports/day • 200,000 wrong drug prescriptions per year • No electricity for 7 hours per month**Six Sigma**• Define • Measure • Analyze • Improve • Control**Six Sigma Black Belt**• Define • Project scope • Metrics • Problem statement**Six Sigma Black Belt**• Measure • Process analysis • Probability and statistics • Collecting and summarizing data • Properties and applications of prob. Distributions • Measurement systems • Analyzing process capability**Six Sigma Black Belt**• Analyze • Exploratory data analysis • Sources of variation • Regression, analyze residuals • Hypothesis testing • Interval estimates • Tests for means, variances and proportions • Paired comparisons • ANOVA • Contingency tables**Six Sigma Black Belt**• Improve • Design of experiments • Design principles • One factor experiments • Full factorial experiments • Fractional factorial experiments • Robustness concepts • Mixture experiments • Response surface methodology • Steepest ascent • Higher order experiments • Evolutionary Operation (EVOP)**Six Sigma Black Belt**• Control • Statistical Process Control • Application of control charts • Analysis of control charts • Advanced SPC • Short run SPC • EWMA, CUSUM • Lean tools for control • Measurement system analysis • Design for Six Sigma • Quality Function Deployment • Robust design • Failure mode and effects analysis**Six Sigma Black Belt**• Improve • Design of experiments • Design principles • One factor experiments • Full factorial experiments • Fractional factorial experiments • Robustness concepts • Mixture experiments • Response surface methodology • Steepest ascent • Higher order experiments • Evolutionary Operation (EVOP)**The Helicopter Experiment**• Design an experiment to study the factors that may affect flight time. • Measure distance from target as well**References**• Paper by George Box • www.statease.com • www.minitab.com • www.asq.org • www.isixsigma.com

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