The intent of this article is to encourage and promote improved environmental design in the development of land by allowing greater freedom and flexibility than is possible under the precise and rigid requirements of conventional zoning districts, through the use of objective standards establishing goals and criteria for judgment rather than the application of a fixed formula. To this intent it allows diversification in the uses permitted and variation in the relationship of uses, structures, open spaces and heights of structures in developments conceived and implemented as comprehensive and cohesive unified projects, while still requiring substantial compliance to the general plan for community development. It is further intended to encourage more imaginative site planning, to assist in achieving more rational and economic development with relationship to public services, to permit optimum development of land and to encourage and facilitate the conservation of open land and other natural features such as woods, streams, wetlands, etc., as integral components of a balanced ecology. It is expected that the planned community development tool will be used to provide comprehensive mixed-use developments within the community design districts.