Thanks David and Hi Bev
 
You are right in terms of what I was hoping for but there might be another  
way and that would be a Pareto Chart showing what the major causes are  with 
all of the categories included. (e. g the PCB, the components and the  assembly) 
though there might be confounding factors. For  example, if popcorning made 
the list would it  be a component problem, a process problem (or a legislative 
one... ;-) 
 
Best, 
Joe




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