Fish Bone Diagram aso called: Cause-and-Effect Diagram or Ishikawa Diagram
The Cause and Effect diagram identifies many possible causes for an effect or a problem. Your team can used this to structure a brainstorming session because it immediately sorts ideas into key categories.
When to Use
When your figuring out the possible factors for a problem.
When your teams thinking hits a roadblock.
Agree on the problem (effect). Write it at the center right (Fish Head) of the flipchart or whiteboard. Draw a box around it and draw a
horizontal arrow running to it.
2- Brainstorm the possible major categories of causes of the problem (5M and 1E).
3- Write the categories of causes as branches from the main arrow.
Brainstorm all the possible factors for each of the major categories. Ask: Why does this
happen? As each element is given, write it as a branch from the
appropriate category (5M ). Causes can be written in several places if they relate to several categories.
Again ask why does this happen? about each branch from step 4.
Write sub-causes branching off the causes. Continue to ask Why? and
generate deeper levels of causes. Layers of branches indicate relationships.
6 After completion, have the team review the diagram. Identify elements that need to be investigated. Circle those items and assign investigation action items to the team.