7 Basic Tools of Quality Control - A Brief Review
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Transcript of 7 Basic Tools of Quality Control - A Brief Review
Quality Control
Cornelius Koo
W. Edwards Deming
Quality: a definition
• “The degree to which a set of inherent characteristics fulfills requirements.”
– Andy Crowe, PMP. The PMP Exam, How to Pass On Your First Try 5th ed.
Normal Distribution Curve
Six Sigma (Std Dev)
σ value
1σ 0.682689492137
2σ 0.954499736104
3σ 0.997300203937
4σ 0.999936657516
5σ 0.999999426697
6σ 0.999999998027
7 Basic Tools of Quality Control
1. Fishbone Diagram
2. Checksheet
3. Histogram
4. Pareto Chart
5. Scatter Diagram
6. Control Chart
7. Flow Chart
1. Fishbone Diagram(Ishikawa, Cause-Effect Diagram)
2. Checksheet
3. Histogram
4. Pareto Chart
Pareto Chart
5. Scatter Diagram(Correlation Chart)
6. Control Chart
Out of Control
• The process is out of state of statistical control under these two circumstances :
1. A data point falls outside the upper or lower control limit.
2. There are nonrandom data points; may happen within the upper and lower control limits.
Rule of Seven
• Refer to a group or series of nonrandom data points that total seven on one side of the mean.
• It tells you that although none of these points are outside of the control limits, they are not random and the process is out of control.
• Should investigate this type of situation and find a cause.
Assignable Cause/Special Cause Variation
• Signifies that a process is out of control.
• It means a data point or series of data falls outside the control limits and requires investigation to determine the cause of variation.
• We can use the cause and effect diagram to try uncover the root cause of the variation.
7. Flowchart