Abstract--Web-based video collaboration environments have transformative potentials for video-enhanced education and for videobased research studies. We first describe DIVER, a platform designed to solve a set of core challenges we have identified in supporting video collaboratories. We then characterize five Collaboration Design Patterns (CDPs) that emerged from numerous collaborative groups who appropriated DIVER for their video-based practices. Collaboration Design Patterns (CDPs) are ways of characterizing interaction patterns in the uses of collaboration technology. Finally, we propose a three-dimensional design matrix for incorporating these observed patterns. This representation can serve heuristically in making design suggestions for expanding video collaboratory functionalities and for supporting a broader constellation of user groups than those spanned by our observed CDPs.