Preparing a Root Cause Report - Possible Root Causes

Bev D

Heretical Statistician
Staff member
Super Moderator
#11
...without categorization Pareto charts and Ishikawa diagrams do not exist.
hmmm. perhaps this is just a semantics thing, but: I use pareto analysis all of the time without 'categorization'. I simply rank order the specific defects or failures by their quantity, COPQ or severity.

for example, for the chemistry analyzer referred to above the top failures may be:
slide insert fail
slide eject fail
Whole Blood Separator spin failure
transport arm crash

these are unique problem statements is in the 'Kepner-Tregoe' form of object-defect. they are not broad categorizations of causes (or defects or failures) as the OP referred to.

As for the fishbone diagram I assume you are referring to the sue of man, material, machine, etc.? If so this doesn't bother me as I never use the fishbone diagram. This categorization is actually what makes the fishbone diagram so weak in Problem solving as it breaks the natural cause and effect chain.
 
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safi99

#12
Was already searching a bit forum, but cannot find...

I am preparing a root cause report (kinda 8D and process audit report in one sheet) and on front page after summary would like to put some choices to choose what kind of root cause was it; system, process, etc. To have on the end some kind of statistics and see what root causes are per each supplier.

So I need your help. If we draw a line, how would you divide root causes?

Thanks in advance
:thanx:
A simple method we are currently using to perform root cause analysis is 5-Why technique. :2cents:
 
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