When using the Ishikawa (Fishbone) Diagram, potential causes are grouped by which categories?

When using the Ishikawa (Fishbone) Diagram, potential causes are grouped by which categories?

• A. 8P's
• B. 4S's
• C. 4M's
• D. 5S's

Answer: (C)

In the Ishikawa diagram, potential causes are organized into four broad areas: Man, Machine, Method, and Material. This structure helps you systematically consider human factors (like training and staffing), the equipment and tools involved, how the work is performed (process steps and procedures), and the inputs or materials used. Grouping causes this way keeps brainstorming focused and ensures you don’t overlook a whole dimension that could be contributing to the problem. While some other frameworks use different category labels, the classic fishbone approach uses these four Ms.

In the Ishikawa diagram, potential causes are organized into four broad areas: Man, Machine, Method, and Material. This structure helps you systematically consider human factors (like training and staffing), the equipment and tools involved, how the work is performed (process steps and procedures), and the inputs or materials used. Grouping causes this way keeps brainstorming focused and ensures you don’t overlook a whole dimension that could be contributing to the problem. While some other frameworks use different category labels, the classic fishbone approach uses these four Ms.