In this paper, we analyze the traces of the activity on a CSCW platform. For that we gather the traces in the higher level shared folders (hlsf ). Based on Activity Theory, the hlsf permit to distinguish between the groups and the goals they pursue. The first group that we will study is constituted of preservice teachers who use the platform to pool and share teaching resources. The second group is constituted of students who use the platform to prepare an examination and the third one is constituted of researchers who use the platform to work together. We will show that according to the groups and their goals the observed activities are not the same.