There are three
areas that will impact the time you have to test.
1. Direct
Testing
Test pertaining to the obvious
change or fix.
Example: If
the login function was changed, you would obviously test logging in.
2. Related Testing
Test pertaining to areas that
may be impacted by the changes made.
Example: If the login function was changed, then you might also
test; creating a new user account, changing user account information or requesting
a forgotten password.
3. Regression Testing
Test you would run on the application
regardless of what has changed.
Example: Accepting an order, accessibility to the online product catalog and store
locator function.