"I believe that what Chiocchetti’s careful and very detailed reconstruction does is to highlights the great differentiation among partisan subjects who would like to be grouped into a single family."Carlo Baccetti, University of Florence, The Professional Review of the Italian Political Science Association"...its contribution goes beyond the bounds of academia insofar as it provides not only a comprehensive and freely available database with temporally homogenized data on party strength of several European radical left parties operationalized based on electoral, governance, and membership strengths (both in term of absolute and weighted strengths), but also a sophisticated methodology that we can apply to other cases to broaden our understanding of the evolution and prospects of radical left in western Europe."Babak Amini, Department of Sociology, London School of Economics and Political Science, London, UK, New Political Science