“… developmental change is a process of equilibration. Thus the process of encountering and resolving disequilibrium brings about developmental change, and developmental change is reflected in the production of structures or organizations of activity that provide greater equilibrium. Developmental change is reflected in the increased differentiation, integration, and hierarchic integration of schemes, wether they are schemes of action or representational thought” (p.31).
Basseches, M., & Mascolo, M. F. (2010). Psychotherapy as a developmental process. New York: Routledge.