When to do manual and when to do automation.

I have heard this question from various testers that they always been asking that when to automate application which testcase we need to automate By reading this post you get to know all.

We should do manual testing whenever 

1-New Functionality

If website contains new features,it should be tested manually first.

2-Test your application only one time:

If you have to test your app only one time it doesn't make sense to waste your time to write in scripts.

3-Frequent requirement changes:

If your requirement is changing frequently not to automate those test-cases.

We should do automation whenever 

1-Regression Tests:

Everytime we get a new build then a regression is needed.For Excecuting each and every test is very time consuming.Thats the main reason we have to do automation.In automation we just make scripts and for regression we just run that scripts.No need to waste your enery and time for same repeated cases.These cases should be done by automated tool.We should try to write common functionalities in our scripted so that we can use it later also.

2-Complex test scenarios :

If we have to test with multiple data sets  at that time automation scripts is necessary.

3-Static & Repitative Tests:

For automating testing class that are repetitive and unchanging up to next test cycle

4-Test Cases which are very time consuming.