Four aspects of preassembled building components are discussed--(1) attitudes on preassembled components, (2) principles of preassembled components construction, (3) structural component case studies, and (4) mechanical component case studies. In section 1, various views on preassembled components are discussed including--(1) the architect's view, (2) the home builder's view, (3) the contractor's view, (4) the owner and operator's view, (5) labor's view, and (6) building code official's view. Section 2 includes--(1) investigation of component construction preassembly, (2) preassembly of components for manufactured homes, (3) on-site preassembly, (4) preassembly of components by the materials dealer, (5) preassembly of components by a product manufacturer, and (6) dimensional relationships of preassembled components. Section 3 covers--(1) preassembled components in large commercial projects, (2) a metal building system, (3) preassembled roof structures, (4) preassembled components in a custom house, (5) the manufacture and distribution of preassembled components. Section 4 includes--(1) the mechanical components of the ferro house, (2) the preassembly of electrical systems, (3) principles for development of mechanical components for home building, and (4) the future of preassembled mechanical components. (RH)