Personality psychology is concerned with differences between individuals;
it overlaps with developmental and social psychology to some extent.
General orientations within personality psychology are the following:
Trait theories propose traits as underlying properties; as such traits account
for behavioural consistencies and stable individual differences between persons.
Situationism argues that behaviour is mainly determined by the situation rather than
by internal personality types or traits.
Interactionism postulates that observed behaviour is a function of the interaction
between the traits of an individual and the specific characteristics of the situation
including traits of other persons who are present.