Following a brief history and explication of the School Construction System Development Project, descriptions of a group of standard building components developed to satisfy three objective are presented--(1) to build better schools, (2) to build them more economically, and (3) to build them more rapidly. Detailed structural and performance specifications are presented for the four system components, namely, the structrual-roof system, the air conditioning system, the lighting-ceiling system, and the interior partitions system. Schematics and photographs supplement the descriptions. (FS)