IN RECENT YEARS, large industrial or power projects have been embracing the concepts of modular construction to meet increasingly aggressive construction schedules. These efforts have typically fallen under the umbrella of "PPMOF," which has been defined by the Construction Industry Institute (in Document IR171-2) as: Prefabrication: A manufacturing process, generally taking place at a specialized facility, in which various materials are joined to form a component part of a final installation. Prefabricated components often involve the work of a single craft.Preassembly: A process by which various materials, prefabricated components and/or equipment are joined together at a remote location for subsequent installation as a sub-unit; generally focused on a system.
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