Medical model - mental disorders involve genetic or neurological factors that can be fixed.
Cognitive-behavioral - mental disorders result from deficits in cognitive processes such as thoughts & beliefs, & from behavioral problems, such as deficits in skills & abilities.
Environmental - being in or seeing a traumatic event can contribute to developing a mental disorder such as PTSD.
Psychodynamic - mental disorders are caused by unconscious or repressed conflicts.
Ψ Three approaches to defining abnormal(deviant)behavior;
Statistical frequency approach - Behavior may be considered abnormal if it occurs infrequently in the general population.
Social norms approach - Behavior may be considered abnormal if it deviates greatly from accepted social standards, values or norms.
Maladaptive behavior approach - Behavior may be considered abnormal if it interferes with the individuals ability to function in personal life or in society. This is the most useful of the three definitions.