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What is a duplicate bug ?

When the reported bug is similar to the previously reported bug then it is called duplicate bug. And developers will REJECT that particular bug.
If you report two bugs whose reproducible steps may be different and the end result may be different but the cause of the defect is same, then it would be considered as duplicate bug.
Duplicate bug is that bug which has already been reported and functionality is same as the reported one.
It can occur because more number of tester works on same test conditions.
It can be because of improper configuration management.
Hi all,

Same bug is reported twice , thrice or more by same Tester or different Tester in the Bug Tracking tools, which represent the same test steps or different test steps, but the bug cause is same is called Duplicate Bugs.