This document discusses designing activities for online collaboration. It outlines Gilly Salmon's 5 stage model for online learning, including preliminary stages of access and socialization, and subject-specific stages of information exchange, knowledge construction, and development. It then provides a case study of online collaboration between students in structural engineering, architecture, and engineering project management. Key lessons from the case study include the importance of establishing trust online through social interaction, using different technologies suited to conveying information, convergence, and storing materials, and the need to design specific social activities to facilitate online relationships. The conclusion emphasizes that online collaboration can be effective for learning but requires a social aspect to maintain trust and communication.