Factors to go for Automation Testing

1. Application needs a set of tests to be executed very regularly due to a software change or defect fix.
2. Application undergoes constant changes and needs regression tests to be re executed
3. Test expected results are clearly identified and documented and is not expected to change every now and then.
4. Performance and load tests needs to be done with large volumes of data and user hits which are impossible to be addressed by the number of available testers.
5. Data driven testing is needed regularly . for eg: if the same test requires to be executed 10 times with different input data sets, it is better to automate.