PDCA CYCLE.

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Presentation transcript:

PDCA CYCLE

7 Basic Tools Flow Chart Check Sheet Histogram Pareto Chart Scatter Diagram Cause & Effect Diagram Run Chart/Statistical Process Control

Flow Charts are used to... document a process improve understanding reveal differences in methods uncover non-value added activities

Flow Chart Example: Self-Serve Gas Before Improvement shut off engine walk to pay station Drive in self serve? check price to pump yes no turn on pump back to car pump gas walk to booth wait transmit approved? check card yes no copy to file return to car employee totals charges check accuracy prepare receipt sign copy on the road again copy to wallet

Flow Chart Example: Self-Serve Gas After Improvement shut off engine check price go to pump self-serve? Drive in insert card in pump yes no wait for receipt store in system approved? yes on the road again pump gas check credit card wait no copy to wallet

CHECK SHEETS Contents mixed Poor taste Low temperature Utensils dirty Data collection & analysis Contents mixed Poor taste Low temperature Utensils dirty Price issue Other

Histograms Graphical descriptive statistics (mean and standard deviation) Uniform Bell-Shaped Bimodal

Pareto Charts Similar to a histogram, used to find “most popular” category Based upon the Pareto principle...

Basic Pareto Diagram Complaints courtesy of my Spring OPC class

Alternate Pareto Diagram Complaints courtesy of my Spring OPC class

Scatter Diagram Graphical descriptive statistics (correlation) Exam Score Class 1 Class 2 Homework Problems

Cause & Effect Diagrams Also known as fishbone diagrams or Ishikawa diagrams, after their creator Kaoru Ishikawa In general, used to find and cure causes (NOT symptoms) of problems

Cause & Effect Example METHODS MANPOWER Drivers lost Poor dispatching Chef late Large order snafus LATE PIZZA DELIVERY FRIDAY & SATURDAY Bad cars Small ovens Lack of ingredients MACHINES MATERIALS

Run Chart Graphical descriptive statistics (trend)

Statistical Process Control Finds “special” variation General form of limits Center line = Average * Not the variance