Triage

Sorting through bugs and doing investigative work to add more information to them is often called bug triage. Incoming bugs get triaged to make sure they have enough information to reproduce the bug, for example. Teams often triage the bugs in their area -- to prioritize them or assign them to a developer to be fixed, or for further investigation.

See:

• https://wiki.mozilla.org/Bugmasters
• https://wiki.mozilla.org/Bugmasters/Guide