Several topics carry heavy weight in making psychologists in the schools more indispensable. Topics of this paper are: (1) the coming transition between "school psychology" of the 20th century and "psychology in the schools" of the 21st century; (2) the critical need for education reform, and the potential impact of such reforms on psychology in the schools; (3) the need to develop a science and research agenda for the 21st century; (4) the needed changes in professional roles and service delivery models for school psychological services for schools of the future; (5) examinations of the education and training of psychologists in the schools across the spectrum of graduate, doctoral, and postdoctoral programs; (6) ethics; and (7) giving psychologists a vision of the future of psychology in schools. The greatest opportunities for psychology in the schools in the 21st century lie with the adding of value to every school psychological service, exclusive of its costs. To create added value, psychologists in the schools must have desire, agency, and will power--but this is not enough. They also need the necessary skills to overcome the obstacles that will stand in their way. "A Formula for the Future" is advanced, which involves balancing logic, emotion, and character. (JBJ)