Statistical Process Control
Understanding and responding to process variation for industrial and energy professionals: common-cause vs special-cause variation, control charts, control vs specification limits, reacting to signals without tampering, and process capability.
54m
Total time
4
Competency levels
12
Lessons
What you'll learn
- Explain the difference between common-cause and special-cause variation, and why confusing the two makes a process worse
- Describe how a control chart works: centre line, control limits, and plotting data in time order
- Distinguish control limits (the voice of the process) from specification limits (the voice of the customer)
- Recognise out-of-control signals such as points beyond the limits, runs and trends, and react appropriately
- Avoid tampering and over-adjustment when a process shows only common-cause variation
- Interpret process capability qualitatively, using Cp and Cpk as measures of how well the process fits within specification
Curriculum
Progress through each competency level in order.
1
Awareness
- 2mTwo Kinds of VariationKnowledge
- 3mThe Two Mistakes and the Cost of TamperingKnowledge
- 7mAwareness Check: Understanding VariationAssessment
2
Knowledge
- 3mControl Charts: Listening to the Voice of the ProcessKnowledge
- 3mControl Limits vs Specification LimitsKnowledge
- 8mKnowledge Check: Charts and LimitsAssessment
3
Skill
- 3mReading Signals and Responding Without TamperingKnowledge
- 3mBuild and Run a Control ChartAssignment
- 8mSkill Check: Responding to the ChartAssessment
4
Mastery
- 3mProcess Capability: Can the Process Meet the Specification?Knowledge
- 3mStability and Capability Review with Improvement DecisionAssignment
- 8mMastery Check: SPC JudgementAssessment
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