What story does the interaction tell? Does it have a satisfying beginning and end? Does the individual need to experience the elements in a particular order?
Experience
At a glance
Will individuals understand what to do if they pay little attention to the instructions?
Critical mass
Does there need to be a particular number of individuals for the interaction to work?
Configuration
Does the interaction work for individuals and groups? Couples and tour groups? School groups?
Investment
Will individuals spend as much time as you hope? What if they don’t?
Battery life
Does the interaction drain the individual’s devices of energy? Will the batteries last?
Focus of attention
Will individuals be staring at their screens rather than their surroundings?