This document summarizes a presentation on coordinating work and knowledge sharing in virtual organizations. It discusses three virtual R&D projects studied - an optical physics collaboration, a medical data sharing network, and a large video game developer. The projects varied in their level of task uncertainty. More technical coordinating mechanisms like standards were used for less uncertain work, while social mechanisms like meetings were used more for complex, uncertain work. Matching coordination methods to a project's uncertainty level on the R&D continuum helps overcome knowledge barriers during deliberations.