Halden Zimmermann’s latest blog post
Benefits:
Use Process Capability analysis to answer questions such as:
- What is the variability in the manufacturing process?
- Is this new equipment performing as expected?
- Which vendor or process should I use?
- What is the predicted process performance?
- What process modifications would be helpful?
- What tolerances should be set along the way so that the final product meets specifications?
DMAIC: Analyze Phase
- This phase makes sense of all the information and data collected in the Measure Phase and uses that data to confirm the source of delays, waste and poor quality.Here, the challenge is to stick to the data and identify the few critical Cause-and- Effect relationships that explain how most of the key process input variables (X’s or root causes of failures) and key process output variables (Y’s) relate to one another.
Analyze Phase Deliverables typically include:
- Identify the key process input variables – “x’s”
- Use LSS tools to perform root cause analysis to identify Critical “X’s”• Cause & Effect matrix
• Failure Modes and Effect Analysis – FMEA - Analysis of Variance – ANOVA
- Main Effects charts
- Regression analysis
Analyze Phase Tools
Cause and Effects Matrix
Purpose: This tool is used to understand and satisfy customer needs. It does so by transferring often vague and general requirements into process parameters. The tool helps the team develop an understanding of the greatest sources of variation within the process and pinpoints the critical few key process input variables (KPIVs) that must be addressed to improve the key process output variables (KPOVs).
- A cause and effect matrix relates process steps to inputs and correlates to process outputs.
- Customer requirements are ranked by order of importance, and then inputs and outputs are rated by their interaction impact.
- It relates the key inputs to the key outputs(customer requirements) using the process map as the primary source.
Application: It should be used to prioritize process input variables (X’s). This is usually done with large processes prior to performing an FMEA. It helps narrow the choice of FMEA project area.
Critical X’s
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