Final answer:
The type of diagrams that are used to depict the causes of a certain problem and for grouping them according to common categories such as machinery, materials, methods, personnel, finances, or management are cause-and-effect diagrams.
Step-by-step explanation:
The type of diagrams that are used to depict the causes of a certain problem and for grouping them according to common categories such as machinery, materials, methods, personnel, finances, or management are cause-and-effect diagrams.
Cause-and-effect diagrams, also known as fishbone diagrams or Ishikawa diagrams, are visual tools that help identify the root causes of a problem or an effect. They are structured as a fishbone, with the problem or effect at the head and the potential causes branching off as the fishbones.
For example, if the problem is a decrease in product quality, the cause-and-effect diagram can help identify potential causes like machinery issues, materials problems, method inefficiencies, personnel training gaps, financial constraints, or management issues.