Impractical to deploy in realistic settings

• Impractical to deploy in realistic settings

• Limitations observed in the context of demos.

• • Touch-screen designed for single-user-at-a-time interaction
  • • single touch point
    • single control cursor
    • required turn taking to avoid errors
  • Used moded-interaction approach
  • • “select-object/select-action/perform-action”
    • causes the users to have to “work” the interface.
    • frequent mode errors
  • The users had to press an object onto the touch screen rather than just placing it.