Most land in Israel (some 93 percent) and much land in the West Bank is controlled and/or owned by the State. Housing projects, and whole towns and villages etc. are built on State land, with parcellation and planning, as well as development of infrastructure usually carried out either by the State or developers. By comparison, most Arab villages and townships (and Arab neighborhoods of some mixed towns) are based on privately owned land, with building carried out mainly by the land owners for their private use. This leads to barriers to effective development, as land may not be available for public needs, parcellation may involve coordination between multiple land owners, and those who do not own land may have difficulty in obtaining housing.