Psychosynthesis has its own unique theory of personality, developmental framework, and distinct techniques that therapists use to guide clients through their process. For example, work with subpersonalities (parts of the personality) involves therapeutic techniques developed by Assagioli and other psychosynthesis practitioners. While subpersonality work in psychosynthesis shares similarities with IFS (Internal Family Systems) and other therapeutic modalities addressing inner diversity, there are also important differences.
Overall, psychosynthesis is an integrative therapy that belongs to both the transpersonal and humanistic families of therapeutic modalities.