Since 1994, we have been involved in the design and use of a series of WWW-based environments to support collaborative group work for students in a technical university in The Netherlands. These environments, and the course re-design that accompanies each new environment, began in April 1994 and continue to the present (March 1998). What are the major issues emerging from this stream of experiences? What are the major lessons we have learned about the design and deployment of WWW-based environments to support collaborative learning in project groups in higher education? How has HCI (human-computer interaction) research informed our work? These questions will be addressed in this paper. One conclusion is that HCI research needs to become more focused on supporting HHD (human-human dialogue) than on human- computer interaction in order to better support collaborative learning in higher education.