Issues that arise because of code anomalies.

Issues that should be addressed immediately due to unwanted system behaviour.

Issues arising from development server operations.

Issues that are major and should be dealt with urgency.

Issues that are not urgent to address but can be handled once major issues are taken care of.

Issues that are important but can be dealt with lesser urgency than high priority ones.

Issues arising that hampers a user's experience with an application's interface.