5-1 Collect & Interpret Data Use SPC to Maintain Current Process Collect & Interpret Data Select Measures Define Process Is Process Capable ? Improve Process Capability Is Process Stable ? Investigat e & Fix Special Causes No Yes No Yes Collect & Interpret Data: Diagnosing Variability Purpose: Begin to understand why there is variability in data collected The Quality Improvement Model
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5-1 Collect & Interpret Data Use SPC to Maintain Current Process Collect & Interpret Data Select Measures Define Process Is Process Capable ? Improve Process.
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Extrude Parison ProgramingExtrude Parison Die Tip TempExtrude Parison Head DesignExtrude Parison Tooling Extrude Parison Support AirThis step uses the Process Map inputs directly. Notice the Process Inputs
follow the Process map step-by-step.
3. List Key Inputs by Process
Step
Bottle Production Example
Note: Only a partial list of inputs
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Rating of Importance to
Customer
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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Process Step Process Input
1 02 03 04 05 06 07 08 0
4. Relate Inputs to Outputs
Cause & Effect Matrix Form
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You are ready to relate the customer requirements to the process input variables
Correlational scoresCorrelational scores: No more than 4 levels 0, 1, 3 and 9
Assignment of the scoring takes the most time To avoid this, spell out the criteria for each score:
00 = No correlation
11 = The process input only remotely affects the customer requirement
33 = The process input has a moderate effect on the customer requirement
99 = The process input has a direct and strong effect on the customer requirement
Place the outputs across the top of the matrix and rank Place inputs down the side of the matrix starting
with the first process step and moving to the last This approach is okay for small process with
relatively few steps Should only be used for processes with a
relatively small number of steps and inputs
General Approach
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Phase IPhase I Place the outputs across the top of the matrix and rank Place the process steps down the side of the matrix Correlate process step to outputs Pareto the process steps
Phase IIPhase II Start a new C&E Matrix with the inputs from the top three
or four process steps Recommended when first starting a project
o Focuses the efforts and gives the team a feeling that they’re working on the important process steps first
o Gives you a running start at the FMEA and preliminary Control Plan Analysis
Focused Approach
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Standard Operating ProceduresStandard Operating Procedures Do they exist? Are they understood? Are they being followed? Are they current? Is operator certification performed? Is there a process audit schedule?
Control Plan Evaluation
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Controllable Input VariablesControllable Input Variables: How are they monitored? How often are they verified? Are optimum target values and specifications
known? How much variation is there around the target
value? How consistent are they?
Other QuestionsOther Questions: How often is the input variable out of control? Which input variables should have control charts?