Software repositories such as Issue Tracking Systems (ITS), peer code review systems, and version control subsystems store trails of different software development activities. The bug history of the ITS database includes unique identification number of the bug, its publisher, priority, status, state, different dates, summary and labels, programmers working on a bug and operating system in which it occurs. ITS follows a defined sequence of activities through its lifecycle from the time it is first reported to when it is closed, viz. unconfirmed, untriaged, assigned, started, fixed, reopened, and verified. Mining ITS will help us identify the sequence of activities actually followed by programmers while resolving a bug and thus help us in identifying the lacunas and improve the process of resolving the issue. Such study can be a step to improve the overall process quality for best software engineering practices. Process Mining is one of the techniques that can provide useful insights into the quality of the process and aid as an assessment tool of ITS process