For the workshop we use a broad interpretation of collaboration in VR, including MR. It is certainly not limited to common tasks such as puzzle solving or model building and includes tasks that use room-scale movements or require body movements. We also consider tasks like attending a lecture or viewing data visualizations together where multiple users are simply present in the same virtual space looking at the same thing together as collaborative. With this broader and more inclusive scope, we hope researchers will explore a variety of novel scenarios that allow users to work, play, learn or create together.