Interpersonal communication and cooperation do not happen exclusively face
to face. In work contexts, as in private life, there are more and more situ
ations of mediated communication and cooperation in which new online tools
are used. However, understanding how to use the Internet to support collabo
rative interaction presents a substantial challenge for the designers and u
sers of this emerging technology. First, collaborative Internet environment
s are designed to serve a purpose, so must be designed with intended users'
tasks and goals explicitly considered. Second, in cooperative activities t
he key content of communication is the interpretation of the situations in
which actors are involved. So, the most effective way of clarifying the mea
ning of messages is to connect them to a shared context of meaning. However
, this is more difficult in the Internet than in other computer-based activ
ities. This paper tries to understand the characteristics of cooperative ac
tivities in networked environments-shared 3D virtual worlds-through two dif
ferent studies. The first used the analysis of conversations to explore the
characteristics of the interaction during the cooperative task; the second
analyzed whether and how the level of immersion in the networked environme
nts influenced the performance and the interactional process. The results a
re analyzed to identify the psychosocial roots used to support cooperation
in a digital interactive communication.