Pablo Levín is Director of the Center for Economic Development Planning and Professor of Economics at the University of Buenos Aires, Argentina. His research and teaching focuses on the History of Economic Thought and Marxist Economics, and in particular the political economy of development planning and socialist strategy. Professor Levín is the author of dozens of articles and book chapters, as well as El capital tecnológico [Technological Capital] (1997). This book, and several recent updates, can be found at www.econ.uba.ar/ceplad (inter alia: Ensayo sobre cataláctica, Los trabajadores y la planificación, Essays on Subsystems). He is currently working with factory workers in production planning.