A primary design goal for VEOS was flexibility, the ability to reconfigure dynamically in real-time. Other systems required shutdown and relinking to make even small modifications in the virtual world. We needed a simple-to-use system that could be run through dozens of tests and hypotheses and designs inside the virtual environment, without turning off the virtual environment.

VR must be a social place, supporting many participants in interaction with each other. VEOS implemented concurrent divergent worlds in which participants share some of the constructed world, while diverging on specified components.

This design position is documented in the first two pieces. These memos are modules later put into the VEOS Overview Descriptions.

The next three pieces are design documents from a second group of students who used the VEOS specification to build a VR system. Everyone worked together to define the lower levels of the architecture, and two separate groups specified and implemented their design. MOSES and VEOS are quite similar.