What info can you not get from observation?

Students should think about writing a 2-page research plan. The plan describes how you test the validity of a theory or theories, without actually carrying out the plan. It is only the description of the test, not actually doing it.You can write: At a social, how you observe a stranger, what qualities can you find out? What info can you not get from observation? Then, you ask someone about the person, using active method to get info. Maybe you get on social media for info. (extra active method). How will contact the person? What info you want to disclose, and why? How will further or terminate the contact? …….. Basically, you write a detailed description of how you want to test a theory, the expected outcome of the test.