Conversation so far:
What was the Orangi Pilot Project?
The Orangi poverty alleviation project (known as the Orangi Pilot Project, or OPP) was initiated by Khan as an NGO in 1980.
Why did he start it?
The project proved an impetus to the socio-economic development of the population of the area.
Are there any other interesting aspects about this article?
Orangi is located on the northwest periphery of Karachi.
Why did Khan start the OPP?
At that time, it was the largest of the city's approximately 650 low-income squatter settlements (known as katchi abadi).
How long did the project run?
By 1993, OPP had managed to provide low-cost sewers to more than 72,000 houses.
The project subsequently diversified into a number of programmes.
How many programs did the project diversified into?
sanitation programme; a housing programme; a basic health and family planning programme; a programme of supervised credit for small family enterprise units; an education programme; and a rural development programme.
Was it a sucess?
The successful OPP model became an inspiration for other municipalities around the country.

Question: What other countries use it?
Self-contained rewrite: Besides Karachi, what other countries use the Orangi Pilot Project?