The bug is prioritized based on the impact of the defect on the application on that module or on the dependent modulee.g If you are not able to create a data which is consumed by the other modules of ...
A bug estimate is based on guidelines established for Severity and Priority. A defect's Severity and Priority levels depend on these factors:1) It's impact on users2) Liklihood of occurrence3) It's perceived value to end-users4) It's value to your company