Many of the readers of the previous edition of this book sent a number of useful comments and suggestions, which have greatly influenced the work on the new edition. The authors are extremely grateful for all the trouble taken to communicate so much valuable information, and hope that this new edition will generate a similar response.
The authors sincerely thank SKAT, ITDG and GATE for their support and cooperation, and particularly for their understanding and patience, when the preparation of this book took longer than originally expected. Special thanks are due to Hannah Schreckenbach of GATE for her detailed comments and suggestions, and for providing so many useful illustrations.
A number of international experts generously provided information and illustrative material, as well as comments, suggestions and technical advice, for which the authors are deeply grateful. It is not possible to include all the names, but mention should be made of Victor Beck (SKAT, St. Gall), Lilia Casanova (RENAS-BMTCS, Manila), Professor Lutz Christians (TU Berlin), Thomas Gieth (CTA, Asuncion), Nicolas Hall (London),Urs Heierli (SDC , Dhaka) , Neville Hill (TERRE , Portsmouth) , Hugo Houben (CRATerre, Villefontaine), Carlos Lola (ATI, Washington, D.C.), Kosta Mathey (TRIALOG, Munich), G.C. Mathur (NBO, New Delhi), Professor Gernot Minke (Gh Kassel), John Norton (DW, Fumel), Alvaro Ortega (Montreal), John Parry (ITW, Cradley Heath), Helmut Stiehler (GATE, Eschborn), Klaus Vorhauer (Karlsruhe), Wolfgang Willkomm (Hanover), Werner Wilkens (DESWOS, Cologne), Ad Wouters (CICAT, Delft).
The sources of information and illustrations have been mentioned wherever relevant. Illustrations without statement of a source are by the authors.
The authors owe special thanks to the Human Settlements Unit of The ESCAP/UNIDO Division of Industry, Human Settlements end technology, on whose behalf Kiran Mukerji undertook a survey of building materials and technologies in ten Asian countries (January to April 1987), for their permission to use some of the materiel collected curing the mission.
And finally, a very special acknowledgement is due to Annette Greve (Starnberg) for so excellently accomplishing the task of preparing the entire text and layout on the computer and for her patience in making so many changes and corrections, before the book was ready for printing.
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