The document discusses various topics in psychology. It begins by defining psychology as the scientific study of the mind and behavior, including conscious and unconscious phenomena like feelings and thoughts. It notes psychology crosses boundaries between natural and social sciences. It then lists several branches and fields of psychology like clinical, cognitive, developmental, and evolutionary psychology. It also defines and provides examples of different psychological methods like introspection, observation, experiments, surveys, interviews, and case studies. In discussing these methods it highlights their merits and demerits. Finally, it discusses factors that influence behavior development like heredity, environment, and individual differences.