Preface to the special issue on user modeling to support groups, communities and collaboration.

Elena Gaudioso Amy Soller Julita Vassileva Preface to the special issue on user modeling to support groups, communities and collaboration. 171-174 2006 16 User Model. User-Adapt. Interact. 3-4 http://dx.doi.org/10.1007/s11257-006-9010-9 db/journals/umuai/umuai16.html#GaudiosoSV06