Interpersonal theory largely concentrates on the things people do and say, and left unsaid and undone, between each other.
The interpersonal approach to human relationships, most gently expressed in the work of Carl Rogers, holds that our relationships are constituted by what passes consciously between us and other people.
It also believes that good will and positive feeling are mostly sufficient in working out inter-personal difficulties.
While interpersonalists have a belief in the psychodynamic aspects of relationships, they tend to focus more on what actually occurs between people than in inner mental dynamics.
