The building-space requirement projected for the balance of the century has stimulated, in the last few years, great interest in the industrialization of building systems. The author has to be come involved with a number of research projects related to panelized building, with the hope of contributing to the development of more economical building systems. A panelized building system is a panel assembly in which factory-built wall and floor panels resist and distribute all loads, provide the three-dimensional rigidity of the building, and eliminate the use of a structural skeleton. Penalizations can lead to standardization and industrialization of building components, the reduction of on-site labor requirements and contingencies due to vagaries of weather, better building design and performance, and to more productivity.