Which quality improvement tool visually groups potential causes into categories such as people, processes, equipment, and environment?

• A. Scatter plot
• B. Ishikawa (fishbone) diagram
• C. Control chart
• D. Gantt chart

Answer: (B)

This item tests your ability to recognize a root-cause analysis diagram that visually organizes likely factors into major categories such as people, processes, equipment, and environment. That kind of diagram helps teams brainstorm and categorize what could be causing a problem, so you can focus investigations on specific areas rather than guessing. The tool that does this and is traditionally called the Ishikawa or fishbone diagram places the problem at the head of a spine and draws main branches for each category (often including people, processes, equipment, and environment). These branches can be expanded with sub-causes, guiding a structured exploration of root causes across different domains.

Other common tools don’t group causes by these domains. A scatter plot shows how two variables relate to each other, not a categorical grouping of root causes. A control chart tracks process performance over time to detect variation, not categories of contributing factors. A Gantt chart maps timelines and dependencies for a project, not causes or their categories.