The most useful tool for identifying the causes of problems is an Ishikawa diagram.

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An Ishikawa diagram, also known as a fishbone diagram or cause-and-effect diagram, is a tool commonly used to identify the possible causes of a problem. It is a visual representation that helps to organize and categorize the various factors that may contribute to the issue at hand. By identifying the root causes of a problem, the Ishikawa diagram can help to develop effective solutions and prevent the problem from recurring in the future.

The Most Useful Tool for Identifying the Causes of Problems