d1cf9e77_erience_in_ArnoLand__July_2009__Yes_but___
[Heuristic] User control and freedom [Justification (From Nielsen)] Users often choose system functions by mistake and will need a clearly marked "emergency exit" to leave the unwanted state without having to go through an extended dialogue. Support undo and redo. [Yes but...] 
This heuristic seems to justify poor design. User control and freedom come more from safety is more than just redo or undo, its the ability to let the user explore and play around with the system. This is done through facile interaction design, a heuristic I have never seen listed.
User Experience in ArnoLand: July 2009
Yes but...