In the continuing series of Defect Tracking Patterns, up next is Incidents and Faults.
A single defect in one piece of code can cause different apparent problems to different users. It is also possible that a single reported problem may be traceable of multiple different pieces of code that are similarly faulty.
Several reported failures that arise out of the same fault should be tracked together. Consider splitting a single bug with multiple causes into a bug for each fault, and relate them as above.
The bug tracking software must support the ability to associate bugs as duplicates of and dependent on other bugs. Splitting a single bug or otherwise tracking related bugs without good support from the tool requires too much manual overhead.