The Plan for Milton Keynes is the strategy which will guide the development of the new city. At its simplest, it is an approach to guiding the urbanisation of a large piece of land. When it was published, the Plan was widely acclaimed as a major step forward in town planning. Critics thought that the flexibility of the Plan was its major strength - clearly it is not possible to identify the dominant and minority life styles for which a city should be catering over the next century. The Plan permits many changes to take place in the built form in response to changing economic and social conditions.