Delivering a bug-free application to consumers is not a perfect or realistic process. Unique situations can still arise, either because nuances were missed in the development or testing phase or the production environment differs from the one used in development or testing.

When a system comes with errors needed debugging and troubleshooting, we first arrange a proper testing of the application with a correct programming to find the problem, we follow the proper log files of that system to detect the problem, also we search the history from the user of that system to make the debugging and troubleshooting process easier. Moreover we use classic tools if needed in some specific situations.