This is an updated and revised second edition of the leading planning theory textbook. It is accessibly written, up-to-date text. It provides a wide-ranging analysis of planning theory and broad international scope of coverage of theories and practice examples. Planning theory has undergone significant changes in recent decades. The revised and updated second edition of this popular text provides a wide-ranging and up-to-date analysis of these changes, how they relate to planning practice, and their significance. It is an essential guide to current planning theory and the post-positivist perspective.