Organisateurs: Michel Balazard (CNRS, Laboratoire Poncelet) , Michael Tsfasman (CNRS, Laboratoire Poncelet, Institut des Probl mes de Transmission de l'Information) , Alexey Zykin (Laboratoire Poncelet, Haute Ecole d'Economie) . ... In this talk, we first motivate the study of zeta functions in families. Then we focus on the study of zeta functions in families of global fields and more specifically that of their logarithmic derivatives (joint work with A. Zykin). ... Laboratoire Poncelet . ...