The International Classification of Functioning, Disability and Health (ICF) provides a framework for describing behaviors by viewing them from three broad and different perspectives: (1) physiologic, physical, and psychological functions; (2) a person's engagement in functional life activities; and (3) their participation in social settings. The ICF Framework aligns well with current efforts in school psychology to adopt population-based models of service delivery, reflect public health models of service delivery, promote mental health, and prevent disorders or problem behaviors. Essential features of the ICF together with implications important to service delivery in general and psychoeducational assessment in particular are described. (Contains 1 table and 1 figure.)