All over the world men are searching for new techniques to pro-vide mass housing,inexpensively and quickly,for millions of low-and-middle-income families,and to meet the urgent housing requirementsbrought on by such natural disasters as flood and earthquakes. All over the world men are searching for new techniques to pro-vide mass housing,inexpensively and quickly,for millions of low-and-middle-income families,and to meet the urgent housing requirementsbrought on by such natural disasters as flood and earthquakes.