 During the last fifteen years of this period (1960–1975), an emphasis was made for a supply side solution, which assumed that industrialised building methods and high rise housing would be cheaper and quicker than traditional brick-built, low-rise housing.Such methods required manufacturing organisations to produce the prefabricated components and organisations to assemble them on site, both of which planners assumed would employ large numbers of unskilled workers-with powerful political contacts.The lack of participation of eventual customers, the residents, constituted one factor in escalating construction costs and poor quality work.