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Perform a root cause analysis > Perform a root cause analysis by using the Ishikawa methodology

Add 5Whys and the Why questions to a cause or child cause in an Ishikawa

For a cause or child cause of an Ishikawa, you can implement the 5Whys methodology by adding the required 5Whys and the Why questions. This allows you to identify the different types of investigation, such as Specific, Detection, or Systemic.

The 5Why inherits Problem Definition from the parent cause and the value of Analysis Dimension from the parent Ishikawa. The Analysis Dimension value is appended to the name of the 5Why. You cannot edit the value of Analysis Dimension in the 5Why created in an Ishikawa cause or child cause. To change this value, edit Analysis Dimension in the parent Ishikawa.

The following video shows how to create an Ishikawa, add its causes, and add a 5Why to a cause.

Source: https://docs.sw.siemens.com/en-US/doc/282219420/PL20251212545240207.problem_solving/xid1962231 · retrieved 2026-07-11