The Lauterpacht Centre for International Law (LCIL), University of Cambridge hosts a regular Friday lunchtime lecture series on key areas of International Law. Previous subjects have included UN peacekeeping operations, the advisory jurisdiction of the International Court of Justice, the crime of agression, whaling, children and military tribunals, and theories and practices for proving individual responsibility criminal responsibility for genocide and crimes against humanity. This lecture, entitled 'Deformalization in International Law - the Temptation of a Move Away from the Theory of Sources', was delivered at the Lauterpacht Centre on Friday 27th April 2012 by Dr Jean d'Aspremont, Associate Professor of Law and Adjunct Research Director, Faculty of Law, University of Amsterdam and chaired by Professor Philip Allott, Emeritus Professor of International Public Law, University of Cambridge. For more information about the series, please see the LCIL website at www.lcil.cam.ac.uk