Is Feature Critical to Product Performance OR Responsive to Variation? Develop Complete List Screening Study Varying Machine / Material Designate as Key Feature Omit From Key Feature Study Repeat for Each Feature Yes No Are Key Product Features Stable Study Key Product Feature Baseline Current Operating Conditions Investigate Process Relationship Investigate Process Variables Repeat for Each Variable Yes No Are Key Features Capable Conduct Designed Experiments Develop process / product “Process Window “ Establish SPC Charting Yes No Key Feature Capability Study Draft Operators Guide Good Cp & Bad Cpk Can Spec. Change? Change Spec. Find Centering Cause & Correct Change Process Machine or Material Yes No Does Process Variable Affect Product Stability Develop Complete List Brainstorm & Fishbone Select Process Variables to Study Designate as Key Variable Omit From Variable Study Repeat for Each Variable Yes No Study Process Variables Are process variables stable Define Source of Instability Change Process Slide 1 Slide 4 Slide 2 Slide 3 Manufacturing Process Improvement The Big Picture AEP 10/21/98

1. Select Key Product Features: Is Feature Critical to Product Performance OR Responsive to Variation? Develop Complete List Screening Study Varying Machine / Material Designate as Key Feature Omit From Key Feature Study Repeat for Each Feature Yes No To Feature Study AEP 10/21/98

2. Study Key Features: Are Key Product Features Stable Study Key Product Feature Baseline Current Operating Conditions Investigate Process Relationship Investigate Process Variables Repeat for Each Variable Yes No From Key Feature List To Variable Study To Process Relationship Study From Process Variable Study AEP 10/21/98

3. Select Key Process Variables: Does Process Variable Affect Stability? Develop Complete List Brainstorm & Fishbone Select Process Variables to Study Designate as Key Variable Omit From Variable Study Repeat for Each Variable Yes No From Unstable Feature Study Return to Key Feature Study Are Process Variables Stable? Study Process Variables Change Process Define Source of Instability No Yes AEP 10/21/98

4. Investigate Process Relationships: Are Key Features Capable Conduct Designed Experiments Develop process / product “Process Window “ Establish SPC Charting Yes No Key Feature Capability Study Draft Operators Guide Good Cp & Bad Cpk Can Spec. Change? Change Spec. Find Centering Cause & Correct Change Process Machine or Material Yes No From Stable Key Features AEP 10/21/98