The second part of the book can better be described as reportorial. Here the industry has been treated as nearly as possible on a factual basis, with opinions given only when there is no other way by which a trained observer may record the facts. This material approaches the status of working data, and we hope that it may be used by men wiser than we to correct the conclusions reached in the first part. The third part of the book is a collection of more detailed appendix material, not suitable for inclusion in the text, but likely to prove use ful to many readers. We have emphasized throughout the book the importance of treat ing the prefabrication of houses as a complete pattern of operations of which management, design, procurement, production, and marketing are the major subdivisions. Indeed, the material in the second part is so organized that the reader will have to look under each of these subdivisions in order to gather all the information on any one com pany. To have organized the material by companies, while maintain ing this emphasis, would have meant endless repetition and a doubling of the bulk of the book.