Claims of reduced construction time, reduced costs, and durability put forth by manufacturers may encourage planners to suspend their judgment based on experience and factual data. The use of predesign, relocatable facilities and prototype designs should be secondary to good planning and design. Planning should include a clear definition of goals, improved communications between planners and administrators and architects, and continuity of oversight throughout planning and construction. Continued evaluation is critical. Finally, premanufactured units should be viewed as only temporary facilities or support structures. Their primary use should be for short-term detention or as temporary additions to existing long-term facilities. 34 notes.