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Lesson 3

Lesson 3. Stabilize the Process. Objectives. You will be able to understand:. Key activities for process stability Difference between special and common cause variation Responsibilities for taking action on variation Difference between specifications and control limits.

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Lesson 3

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  1. Lesson 3 Stabilize the Process

  2. Objectives You will be able to understand: • Key activities for process stability • Difference between special and common cause variation • Responsibilities for taking action on variation • Difference between specifications and control limits

  3. Lesson 3: Stabilize the Process Activity 3.1 Determine process measures Activity 3.2 Examine the process by using control charts Activity 3.3 Act on special causes Activity 3.4 Check for capability

  4. Activity 3.1 Determine Process Measures • Process measures must: - be objective and representative of the process - measure appropriate quality characteristics • Flow charts are useful tools for determining process measures

  5. Determine Process Measures Products & Services CVN Processes Air Wing Suppliers Processes Outputs Outcomes Inputs • Quality of supplies • Time to deliver • Condition of materials • Accuracy of information • etc. • Ordnance assembly • Moving ordnance • Staging ordnance • etc. • Launch/ recover • Berthing / messing • Training time • etc. • Timely launch /recovery • Safe launch / recovery • Effective launch / recovery • Satisfaction with service • etc.

  6. Run Chart 55 50 45 Elapsed Time (minutes) 40 Average 35 30 Sequence • Line graph showing variation plotted over time

  7. Activity 3.2 Examine the Process by using Control Charts Upper Control Limit Average Measurement Lower Control Limit Time or Sequence • Line graph that shows process variation • Limits calculated from process data

  8. Data appear randomly • Control limits provide predictable range Common Causes UCL Average Measurement LCL Time or sequence

  9. Special Causes UCL Average Measurement LCL Time or sequence • Appear as nonrandom variation • Are not predictable

  10. Activity 3.3 Act on Special Causes Common Causes: - Inherent in the process - Affect everyone in the process - Affect all outcomes of the process Special Causes: - Are not in the process all the time - Do not affect everyone in the process - Arise because of specific circumstances

  11. Responsibility for Reducing Variation • Special cause - people working in the process • Common cause - command’s leaders & managers

  12. Avoid Tampering and Underadjusting • Taking action when no action is needed • Failing to act when action is required

  13. Specifications vs Control Limits UCL Measurement Specifications LCL Time or sequence

  14. Activity 3.4 Check for Capability • Unstable - Measures fall outside control limits, or - Measures show non-random pattern • Stable - Measures fall randomly within control limits • Capable - Stable process that also meets customer or mission requirements

  15. Stability and Capability UCL USL LSL LCL Situation 1

  16. Stability and Capability USL UCL LCL LSL Situation 2

  17. Stability and Capability UCL USL LCL LSL Situation 3

  18. Stability and Capability USL UCL LCL LSL Situation 4

  19. Lesson Summary Stabilize the Process Activity 3.1 Determine process measures Activity 3.2 Examine the process by using control charts Activity 3.3 Act on special causes Activity 3.4 Check for capability

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