This monograph describes and assesses the value of a program for the certification of those aspiring to the principalship in Ontario. An existing program, offered through the Centre for Principal Development at the Ontario Institute for Studies in Education, was taken as a point of departure for the period. From this experience, a prototype curriculum was developed using two bodies of research-based knowledge: knowledge concerning effective school administration practices and knowledge concerning the design of effective adult instruction. The resulting prototype consists of the following components: (1) a conception of effective school administration; (2) curriculum objectives based on this conception; (3) a model of adult learning; (4) instructional strategies reflecting such a model; (5) instructional materials; and (6) student and curriculum evaluation procedures. References are included, and sample instruments are appended. (Author/TE)