![]() ![]() The Six Sigma Master Black Belt assigned to the team held a brainstorming session to try and identify potential root causes.Īfter gathering all the ideas, the team developed an Affinity Diagram and identified several themes or possible root cause categories. They put an improvement team together to try and understand what the causes of their reduced competitiveness might be. ![]() Perform another iteration to determine root causes if necessary.Īn industry example of a fishbone diagramĪ software company was concerned about losing business to their competitors.Work on the most important root causes.If you have existing data or can collect data on the potential causes, then you can make objective rather than subjective decisions about the validity of that potential root cause. Discuss the causes and decide which are most important.Ask why each major cause happens at least 5 times. Major causes may include the 6 M’s: manpower (or personnel), machines, materials, methods, measurements, and mother nature (or environment).Typically, your fishbone diagram will have 4-6 main bones representing the major causes of what you are analyzing.This can come from the themes in your affinity diagram. Decide the major categories for causes. ![]() Name the problem or effect of interest.The process for creating a fishbone diagram is as follows: The smaller bones represent the cascading and drilling down of possible root causes. The main bones are the major categories of possible root causes. The head of the fish represents the problem being addressed. The graphic below shows the format for a fishbone diagram: The basic concept was first used in the 1920s and is considered one of the seven basic quality control tools. Overview: What is a fishbone diagram?įishbone diagrams, also known as Cause and Effect Diagrams, Ishikawa diagrams and the 6 Ms, were popularized in the 1960s by Kaoru Ishikawa, who pioneered quality management processes in the Kawasaki shipyards. This is typically done in the Analyze phase of the Six Sigma DMAIC process. Affinity diagrams are used to do a high-level organization of the ideas and the fishbone diagram is used to drill down and do root cause analysis. Brainstorming is the primary tool for generating ideas. Interested in expanding your knowledge on Lean Six Sigma? Take your career to the next level and join ISSSP today! Access the hundreds of videos, webinars, whitepapers, case studies, and other resources available in our library.The three phases of the creative process are idea generation, organization, and assessment. SuggestionsĬonsider using the Reverse Fishbone during the Pilot Project implementation in the Improve Phase of your Lean Six Sigma project in order to analyze the effects of your improvement solution(s).ĭon’t you wish that all government policymakers would at least sit down and do a simple reverse fishbone analysis before rolling out a new directive? An article published by the Meeting Tool Chest describes the diagram and gives some guidance for its use. ![]() In a presentation titled “Using QI Tools: Action Effect Diagrams” from Healthy London by Tom Woodcock we learn how the Action Effect Diagram can be used in the healthcare field.Īlso, as we mentioned earlier, yet another name for the Reverse Fishbone Diagram is the Solution Effect Diagram. To go directly to the discussion of the reverse fishbone, start the video at 10:20.Įarlier we mentioned that another name for the reverse fishbone diagram is the Action Effect Diagram. In another video from I-Nexus, Christian Loyer discusses the traditional fishbone and the reverse fishbone diagrams. We’ll start with a video from Dennis Taboada, CEO of DTI Training Consortium introducing the Reverse Fishbone Diagram with a simple example. We brainstorm how the proposed change impacts these areas. Potential impact areas, which could be the usual People, Methods, Materials, Measurement, Machines, and Environment are the bones. The proposed change is at the head of the fish.
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