It examines each theory with rigorous and scrupulous tests to see if it describes reality. The scientific method works well in observing and recording physical data and in reaching conclusions which either confirm or nullify a theory. They believed that if people could be studied in a scientific manner, there would be a greater accuracy in understanding present behavior, in predicting future behavior, and, most controversially, in altering behavior through scientific intervention. Personality theorists study individual behavior. Comparative psychologists study animal behaviors across the range of species Physiological psychologists are concerned with the biological basis of behavior.
Developmental psychologists study principles and processes responsible for change throughout life.
Cognitive psychologists investigate memory, thought, problem solving, and the psychological aspects of learning. Analysis of behavior studies the conditions under which a behavior can be learned and the situations that cause that behavior to occur. Learning is an area of psychology exploring how new behaviors are learned and maintained. Clinical psychologists study ways to help individuals and groups of individuals change their behavior. Industrial and organizational psychologists are concerned with the physical and social aspects of people's work environments as they affect work output.