I haven't used a Fishbone Diagram in several years almost ten to be specific. BUT when I did use it, it was very helpful. At one company, we were having problems with a specific application. The company that we purchased the application from could not find a problem or replicate the problem so the VP of Opperations and myself sat down and he introduced me to the Fishbone diagram and after reviewing everything. We forward our results to the company and they found the problem and were able to fix the code that was causing the problem. The company spot lighted us in their customer magazine and also provided us with one year of free technical support on our service contract.