Traditional modes of providing physical infrastructure on unimproved s
ettlements for the urban poor are unlikely to meet the ever-increasing
demand for services. New policies for implementation, management and
use of more appropriate technologies are required. Conventional high l
evels of service are shown not to be affordable. An alternative policy
strategy involving a participatory support approach is explored. This
plans for the provision of 'primary level' services with view to subs
equent upgrading, which is to be managed by householders and communiti
es. Implications for households, communities and institutions are addr
essed, and reference is made to the experiences of the low cost sanita
tion and sewerage programme of the Orangi Pilot Project in Pakistan.