Physical and Virtual Tools: Activity Theory Applied to the Design of Groupware.

Morten Fjeld Kristina Lauche Martin Bichsel Fred Voorhorst Helmut Krueger Matthias Rauterberg Physical and Virtual Tools: Activity Theory Applied to the Design of Groupware. 153-180 2002 11 Computer Supported Cooperative Work 1-2 db/journals/cscw/cscw11.html#FjeldLBVKR02