Presence means the experience of being in a virtual environment. People who are present in a virtual environment have the experience of being in the virtual place, focus their attention on the virtual environment and experience it as somehow real.
Presence is probably the central variable for interfaces and applications in virtual environments.
Two more investigations have looked on how the possibility to interact with the virtual environment increases presence. The current project Presence Questionnaire II is based on this survey and develops it further. There is now a German and an English version of the questionnaire. Users of virtual environments are asked to fill out a questionnaire on the Web. The questionnaire has a modular structure.