A psychologist evaluates, diagnoses, treats, and studies behavior and mental processes (see also the article about Psychology). Some psychologists, such as clinical and counseling psychologists, provide mental health care, and some psychologists, such as social or organizational psychologists conduct research and provide consultation services.There are many different types of psychologists, as is reflected by the 56 different divisions of the American Psychological Association (APA). Psychologists are generally described as being either "applied" or "research-oriented". The common terms used to describe this central division in psychology are "scientists" or "scholars" (those who conduct research) and "practitioners" or "professionals" (those who apply psychological knowledge). The training models endorsed by the APA require that applied psychologists be trained as both researchers and practitioners, and that they possess advanced degrees.Most typically, people encounter psychologists and think of the discipline as involving the work of clinical psychologists or counseling psychologists. While counseling and psychotherapy are common activities for psychologists, these applied fields are just one branch in the larger domain of psychology. Research and teaching comprise a major role among psychologists. Technological advances in the future may increase the usage of computerized testing and assessment services in order to do some of the jobs of psychologists, including recognizing mental disorders.