CHAPTER 4
 RESULTS

 4.1 Description of Studies

 The system was evaluated using three studies, each with two actors. The first

study was conducted before the system was fully operational. The second and third

studies were conducted using the complete system. The aspects of the system that

weren't incorporated into the first study included the introductory movie, head-controlled

viewpoint, and accurate hand tracking.

 The participants (4 females and 2 males) ranged in age from 18 to 20. They had

significant acting experience. Before each study, each participant was given a small

tutorial on how the system worked, a brief overview of its limitations, and some time to

see his/her character being manipulated by his/her movements. The participants then

watched the introductory movie and rehearsed the scene provided for them. When the

scripted lines ended, the participants were given time to adlib. Each study concluded by

having participants fill out a presence and co-presence questionnaire.

 All three sets of participants were given the co-presence questionnaire used in

Collaboration in Tele-Immersive Environments. This questionnaire gauges the degree to

which each participant felt they were "present" in the virtual environment with the other

participant. The last two sets of participants were also given the Slater, Usoh and Steed

(SUS) Presence questionnaire. The SUS questionnaire is commonly used to assess