Scenarios which are preferred/not preffered for automation testing

Scenarios which are preferred for automation testing:

In general scenarios which are complex and more repeatable those are more suitable for automation testing

Ex:

                  -Sanity Test scenarios

                  -Regression test scenarios

                  -Scenarios which are required multiple set of test data to validate (i.e. Re-Testing)

                  -Compatibility Test scenarios

     Scenarios which are not preferred for automation testing:

In general scenarios which are simple and which are not repeatable those are performed manually only

Ex:

                  -User Interface test factors

                  -Usability test factors

                  -One time testing activities

                  -Ad-Hoc testing/Random testing activities (i.e. Informal testing)

    Note: For an application there can be manual testing team and automation testing team but automation                    testing is an optional