It's a classic book but is still worth to read. It illustrates the debate in those years when planning was a less mature discipline (having little supporters) than today. The messages of the book are clear, aimed at clarifying the nature of the planning process. Also, it guides what planners and academia can do to advance the discipline. Surprisingly, it seems nothing has significantly improved in existing planning practice since the book was first published (my opinion). Planning is still struggling to find its actual contributions to achieving societal goals (sustainability, welfare, environmental quality, etc.). We probably need to re-read the book or read it carefully.