Audience members as observers in artist-defined locations:
Audience as spectators and listeners, immediacy of experience (emphasis on here and now), emphasis of spatial and sensual experience, "active" interaction only by proxy, "passive" interaction, responses internalised, stillness, contemplation, less potential for improvisation.
Open and closed systems in action, accessed in galleries and museums, not responding to the viewer Live performances with traditional division between audience group and performers, audience often seated in rows, facing the performers. Performance might include elements of improvisation or chance: Live performance but with strong emphasis on non-active audience involvement in the work: Video and/or audio installation of generative prcesses completed earlier and/or elsewhere; also audience members encountering previously composed site-specific work i the location:

Audience members as participants in artist-defined locations:
Audience as participants in a live session in an artist defined location, "active" interaction, communication, collaborative ownership of work, responses can be externalised, immediacy of experience (emphasis on here and now), direct experience through the senses, high potential for improvisation, but also contemplation.

Individual participants experiencing a responsive environment or generative system: One or several participants experiencing a responsive or generative environment: Live audience interaction involving two or more spatially remote partners: Responsive environments particularly designed for multiple players :

Audience temporarily and spatially remote:
"active" interaction but temporally or spatially removed from location, remote or delayed experience, contemplation, low potential for improvisation.
A software application that simulates a live process after a remote visitor initiates a process, the visitor can see traces of other users' presence. A software application on a local machine that simulates a live process after a user initiates a process, no traces of other users' presence. Online applications simulating live processes in their own timeframe, different from real time. Audio documentation of generative prcesses completed earlier and/or elsewhere;