This directory contains a development of epistemic logic together with two examples: the wise men and the muddy children. http://perso.ens-lyon.fr/pierre.lescanne/COQ/EPISTEMIC/epistemic.pdf (or http://perso.ens-lyon.fr/pierre.lescanne/PUBLICATIONS/epistemic_2.pdf) is a paper which may serve as an introduction to the implementation. Pierre LESCANNE | Tel: (0)4 72 72 86 83 Ecole Normale Superieure | Fax: (0)4 72 72 80 80 F69364 LYON Cedex 07 FRANCE | E-mail: Pierre.Lescanne@ens-lyon.fr more information on www at