TABLE OF CONTENTS The main method used to define and organize causes is called cause and effect analysis. It is also called fishbone analysis (because the finished diagram looks like a fish skeleton) or an Ishikawa diagram after the creator of this method. In the process management methodology we will call it fishbone analysis.
A fishbone diagram is a visual representation of the relationship between some effect and all the possible causes that influence it. It provides a structured and disciplined way of identifying the root causes of a selected problem. This allows the use of open-ended discussion and lateral thinking to arrive at new and innovative ways of looking at old problems.
In the process management methodology a fishbone diagram is most often used:
In Step 9, "Detail Causes," to identify and document the causes of an effect.
A fishbone diagram, as shown in Figure A.16, is used to document the analysis of effects and their causes.
On the fish head, write the problem (or effect) for which you want to find the causes. The effect should be clearly worded to show what is to be eliminated, for example,
Too many warehouse shipping errors
Delivery lead-time is 30% too long
Using the brainstorming rules from Appendix A-1, brainstorm a list...
