Misadventures in Amniocentesis

Given the income distribution of the urban poor, it is essential that technical innovations suit the needs of different income groups. Starting from very inexpensive means of improving shelter (such as above examples), they could include, for those with relatively higher incomes, a range of building components which are easy to assemble. The emphasis need not be on long-term durability, with regular maintenance, which is the usual practice in habitable condition; also, changing age and family structure as well as income favour some flexibility in the design of houses.