Development can have a substantial impact on the character of the community in which it is located. Harmful effects of land use can be prevented through zoning, housing and building codes, and community input. Other aspects of development are subtler and less amenable to exacting rules of thumb declared without specific development proposals. Among these are the general form of the land/structures before and after development, the spacial relationships of the structures and open spaces to proximate land uses, and the appearance of buildings and open spaces as they contribute to an area as it is being developed. Such matters require the timely exercise of judgement in the public interest.