A Model for CSCL Allowing Tailorability: Implementation in the "Electronic Schoolbag" Groupware. - Christian Martel; Christine Ferraris; Bernard Caron; Thibault Carron; Ghislaine Chabert; Christophe Courtin; Laurence Gagnière; Jean-Charles Marty; Laurence Vignollet (CRIWG, 2004)