Six Sigma Green Belt Certification Practice Exam

In Six Sigma, which tool is primarily used to identify and eliminate the causes of defects?

1. Fishbone diagram

2. Control chart

3. Histogram

4. Pareto chart

The correct answer is: Fishbone diagram

The Fishbone diagram, also known as the Ishikawa diagram or cause-and-effect diagram, is a crucial tool in Six Sigma for identifying and eliminating the causes of defects. This diagram visually represents potential causes of a specific problem by categorizing them, typically into major categories such as people, processes, equipment, materials, measurements, and environment. By utilizing this structure, teams can systematically examine each category to uncover root causes of defects. This method is particularly valuable during the Analyze phase of the DMAIC (Define, Measure, Analyze, Improve, Control) process, as it encourages collaborative brainstorming and helps teams focus their efforts on the underlying causes rather than symptoms. Overall, the Fishbone diagram facilitates a thorough investigation into complex problems, supporting a comprehensive approach to defect elimination in processes.