Test scenario will be framed on basis of the requrement,which need to be checked.For that,we will frame set of testcases,in other terms,we can say all the conditions,which can be determined the testing coverage againest business requirement.
Please see the below example,which is exactly matched to my explanation.
As we know all most all the application are having login screen,which contains login name and password.Here is the test scenario for login screen.
Scenario: USER'S LOGIN
Condtions to be checked to test the above scenario:
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1.Test login field and Password fields indicisually.
2.Try to login with valid login and valid password.
3.Try to login with invaling login and valid pwd. etcc........................................
