Cause Effect Matrix for Excel

Performing Root Cause Analysis

The fishbone or Ishikawa diagram is one way to show cause-effects (a.k.a., root cause analysis-RCA). Another method uses a cause-effect Matrix.

QI Macros Cause Effect Matrix Template

Cause Effect Process

  1. Identify the key process outputs, requirements or effects. These are also known as critical to quality (CTQs).
    Optional: Add Upper and Lower Specification Limits (USL/LSL) and target to each output.
  2. Use a weighting factor (e.g., 1-5) to identify the importance of each output to the customer.
  3. For each process step, identify the key process inputs (i.e., causes).
  4. Then use a weighting factor (e.g., 1-low, 3-medium, 9-high) to show the impact or correlation of the input (cause) on each output (effect).
  5. The resulting total impact will be shown in the far right column and the ranking/priority of each input.

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