Increasing pressure on the building industry and competition for its resources has caused many authorities to make more extensive use of factory-made components for their school building projects in both conventional and system building. A common dimensional controlling discipline has been developed to aid architects and administrators in school design. Controlling dimensions are set forth for structural system, ceiling heights, floor and roof depths, changes of level and the spacing of structural supports. The preferred dimensions are intended to set the dimensional framework for components, but not to establish actual dimensions for individual components. Diagrams and sketches of various building components explain the application of the dimensional framework to various methods of construction. (TC)