The ideals of planning suggest that development and public infrastructure can be implemented in an atmosphere of complete harmony and that environmental, social and economic disruption can be minimized. This assumes that there is full knowledge of the social, economic, political and physical systems within which such development is operating. In the ideal atmosphere, development is weighted in favor of the benefits of future as well as current populations and such benefits tend to be available to all levels of society and do not create a restriction to a part of society or present a barrier to a particular group.