The “Cause and Effect Diagram” is used to:

The Cause and Effect Diagram, also known as an Ishikawa or fishbone diagram, is a fundamental quality management and business analysis tool. Its primary purpose is to structure a brainstorming session to systematically identify and categorize the potential causes of a specific problem (the "effect"). By organizing potential causes into distinct categories (e.g., People, Process, Materials, Equipment), it facilitates a thorough investigation to uncover the fundamental reasons for an issue, which is the core activity of root cause analysis (RCA). The diagram helps teams move beyond symptoms to identify the underlying problems that need to be addressed.

A. Enhancing Customer Satisfaction is a potential strategic goal or a positive outcome of solving a problem, not the direct function of the diagram itself.
C. Reducing Product Costs is a potential application or result of the analysis, but the diagram's core function is to analyze causes, not directly reduce costs.
D. This is incorrect because option B accurately describes the primary and universally recognized purpose of the Cause and Effect Diagram.

1. de Mast, J., & Lokkerbol, J. (2012). An analysis of the Ishikawa diagram. Quality Engineering, 24(2), 146-160. The paper states, "The Ishikawa diagram is a classical quality tool, which is used to structure the search for the root causes of a problem" (p. 146). DOI: https://doi.org/10.1080/08982112.2012.661004

2. MIT OpenCourseWare. (2004). 15.081J Introduction to Mathematical Programming, Lecture 18: Introduction to Quality Control. Massachusetts Institute of Technology. The lecture notes describe the Cause-and-Effect Diagram as a tool to "Identify and organize possible causes of a problem" (p. 4).

3. American Society for Quality (ASQ). (n.d.). What is a Cause and Effect Diagram? ASQ Quality Resources. Retrieved from asq.org. The official resource states, "Also called: Ishikawa diagram, fishbone diagram... The cause and effect diagram is used to explore all the potential or real causes... It is used to... identify the root causes of a problem."