Psychologists carefully control conditions and measure behavior by carefully analyzing human behavior at different situations. This can be done as a procedure while performing the the experiment research.
Psychologists are the expert persons who can explain and control mental behavior of the patient. dekhen ki or a person who is going through mental stress or depression. They have their own strategy and procedure for curing the patient. When a person is mentally not stable, through his or her action we can get to know about it.