Quality Factors
An effective travel technique promotes:
1. Speed (approximate velocity)
2. Accuracy (proximity to the desired target)
3. Spatial Awareness (the user's implicit knowledge of his position
and orientation within the environment during and after travel)
4. Ease of Learning (the ability of a novice user to use the technique)
5. Ease of Use (the complexity of cognitive load of the technique from the user's point of view)
6. Information Gathering (the user's ability to actively obtain information from the environment during travel)
7. Presence (the user's sense of immersion or "being there”)