This book provides an excellent classification of borders as viewed by various disciplines as well as providing a framework to understanding the changing nature of borders. In this manner, the work by Popescu is reminiscent of the work of Ellwyn R. Stoddard. Understanding the spatial characteristics of borders and reviewing its impact on the formation and transformation of borders is innovative. Finally, the author offers an excellent review of modern attempts to control mobility across borders. The final chapter reviews, within the framework constructed, the various types of cross-border cooperation. His review of this cross-border cooperation is as innovative as the work of Remigio Ratti and Shalom Reichman,?Theory and Practice of Transborder Cooperation, was in 1993. This book will be useful to students as well as seasoned researchers.Clearly written, extremely informative and well structured, Gabriel Popescus work provides a theoretical insight into the changing nature of borders, particularly in the past two decades and, at the same time, can serve as a useful guide through the maze of multidisciplinary border studies. It can be recommended to students of geography, political science and international relations, to social scientists interested in borders, transnationality, mobility and geopolitics, and to experts dealing with cross-border cooperation and migration in government, business, international organizations and NGOs.A very readable account of contemporary theoretical approaches in border studies across a range of disciplines. It emphasizes how borders are and will remain central factors in contemporary international affairs and directly affect our daily lives. The bibliography is also a valuable tool for further reading.This is simply the best up-to-date survey of border studies I have seen. Popescu shows easy command of a wide range of sources in a number of languages. The approach and writing are such that a wide array of readers will find this booklÃÈ