The Internal Family Systems Model is an integrative approach to individual psychotherapy developed by Richard C. Schwartz in the 1980s. It combines systems thinking with the view that the mind is made up of relatively discrete sub-personalities, each with its own unique viewpoint and qualities. IFS uses systems psychology, particularly as developed for family therapy, to understand how these collections of sub-personalities are organized.
Read more about it: https://ifs-institute.com/