Digital edition from the 2011's print versión. The essays compiled in this volume, written by distinguished experts, present a broad panorama of the most important methodological challenges faced by conceptual history today, as well as some more specific contributions regarding the temporal dimension of certain modern concepts. At a moment when time and concepts –and political concepts in particular– are no longer obvious and taken for granted but have themselves become historical matter, this book does not limit itself to an updating of the state of the art; it also offers very useful lessons for the development of future research into this field.