Fishbone diagram

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.

NOTE

If there are branches that are too crowded, split them into different branches.

OUTPUT

A diagram showing causes and effects.

NEXT

Identify possibilities and opportunities for your design.

Source: Digital Society School

REFERENCE: 

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.