Up to now this book has been an introduction to the problems and the content of spatial planning, treated historically. That has been its aim, as the preface indicated. But now, this last chapter tries to make a bridge to the actual process of planning, as it is carried out by progressive planning authorities at the present time. This process is based strongly on theoretical concepts, which are well set out in modern textbooks of planning. Therefore, this chapter, which tries to distil the central content of these more advanced texts, will perhaps serve as an introduction to them for the student of planning.