Book excerpt: This is a work summarizing in one volume the pioneering approach of the author to public-interest decision-taking in the field of urban & regional planning. This book is aimed at students, researchers and professionals in planning. Nathaniel Lichfield first introduced in his "Economics of Planned Development" the concept that, in any use and development of land, the traditional "development balance sheet" of the developers needed to be accompanied by a "planning balance sheet" prepared by the planning officer or planning authority. Over the forty years since this work was published, the author has brought to the operational level the "planning balance sheet", with many case studies, primarily for consultancy purposes. The present title reflects the incorporation during the 1970s of the then emerging field of environmental impact assessment.