1. Evaluation of take-over techniques for limited interaction resources Objectives: Determine the preferred take- over technique Evaluate the impact on the task completion performance Evaluate the user acceptance of proposed take-over techniques

2. Experimental setup GUI Users Hardware:  Steerable Camera Projector  Microphone headsets  Portable Display Surface Software:  Speech detector [D. Vaufreydaz]  Conversation modeling [J. Maisonnaisse]  Finger tracking [J. Letessier]  PDS tracking  Drawing application

3. The task Collaborative reconstruction of a graph

4. The User Interface

5. Experimental conditions The proposed take-over techniques: None – fixed interface (the reference) Explicit touch-based steering Explicit direct manipulation take-over Implicit voice-based steering

6. Explicit touch-based steering

7. Explicit direct manipulation

8. Implicit voice-based steering Rules controlling the interface location: Interface is steered toward the “main speaker” Interruptions are ignored Drawing inhibits vocal steering Conflicts result in loss of interface control

9. Results

10. The preference: #1button-based control #2the PDS #3fixed interface #4voice-based control

11. Results