Fishbone diagrams show the causes of a specific event.
To analyze possible problems that can help make design decisions. This method allows to get a clear overview of causes and effects.
1. Prepare the six arms of the diagram on a whiteboard.
2. Define the problem clearly as a short statement in the head of the diagram.
3. Describe the causes of each bone and write them down at the end of each branch. Use the 4 Ms as categories: Machine, Man, Methods, Materials.
4. Minor causes are listed around the major causes.
5. Interpret the diagram once its finished.
If there are branches that are too crowded, split them into different branches.
A diagram showing causes and effects.
Identify possibilities and opportunities for your design.
Source: MediaLAB Amsterdam
ISHIKAWA, Kaoru; ISHIKAWA, Kaoru. Guide to quality control. Tokyo: Asian Productivity Organization, 1982.
DALE, Barrie G.; VAN DER WIELE, Ton; VAN IWAARDEN, Jos. Managing quality. John Wiley & Sons, 2007.