The Internal Family Systems Model (IFS) is an integrative approach to individual psychotherapy developed by Richard C. Schwartz in the 1980s.[1][2] It combines systems thinking with the view that the mind is made up of relatively discrete subpersonalities, each with its own unique viewpoint and qualities. IFS uses systems psychology, particularly as developed for family therapy, to understand how these collections of subpersonalities are organized.[3]
The Internal Family Systems (IFS) model was developed by Richard C. Schwartz in the 1980s and describes and integrative, nonpathological approach to psychotherapy.... The premise of IFS is that similar to the complex external family system, individuals are composed of separate and multifaceted internal parts in relationship with each other. IFS's primary focus is to work with individuals and help differentiate parts or subpersonalities in the mind.
[Schwartz] brought family therapy theory and technique to the intrapsychic worlds of clients and, in so doing, discovered ways of working with individuals, couples, and families that is unique and evidence-based. IFS has become not only a school of family therapy but also a major form of psychotherapy in general, with a vast literature and training institutes throughout the world.