This booklet is intended to inform school district officials, school planners, and manufacturers of the Bureau's criteria for adequate housing. Part 1 discusses the portable classroom impact, presents data about portable classrooms, and states the Bureau's policy regarding portables. Part 2, performance specifications, is presented to clarify the State's recommendations for manufacturers. Part 3 contains an evaluation questionnaire keyed closely to the performance specifications for manufacturers and potential clients to use in rating a transportable building against the minimum design standards and in identifying design deficiencies. Part 4, problems of compliance with Title 21, consists of a series of questions dealing with manufacturers' compliance with State codes answered by the State attorney general. Part 5 contains the procedures for acquiring portable buildings. (Author)