Dealing with Undo
Roberta Mancini, Alan John Dix, STEFANO LEVIALDI · 1997
In this paper we are going to take into account non-determinism in human-computer interaction. When a user is in control on the dialogue, that is he knows the system state and the system behaviour after any performed action, then the interaction is deterministic. Generally, an undo helps the user in handling non-determinism when he is employing such function as a navigational tool, and/or in reducing non-determinism when he is employing it as a recovery function. Unfortunately, not all functions at the application level may be undone: moreover, an undo may behave differently in different situations. As result, we have that the undo also adds risk along the interaction: the more powerful the system, the higher the risk!