A school psychologist is minimally a well-trained psychologist and optimally a Renaissance person whose activities, often but not necessarily conducted in schools, are focused directly or indirectly on children and their caretakers, on caretakers-to-be, and, increasingly, on learners of all ages. The contextual core of school psychology is concern with learners in the educational program, with the educational program afforded all learners, with the psychological well-being of learners as it affects their educability, with the educational program as it affects their psychological development, and with the total physical, social and emotional setting in which children spend their formative years. In actual practice and in this context, school psychologists work with individuals, groups, or systems, in or out of the school setting, in myriad subsets of the roles just implied.