[Sigia-l] Error Prevantion Heuristic (slightly OT)

[Richard_Dalton at vanguard.com]

One of Jacob's much touted "10 Heuristics" is: "Even better than good error messages is a careful design which prevents a 
problem from occurring in the first place". Sometimes though I think this 
can be taken too far ... for example, if a system's acceptable inputs are 
within the range 10-500, should the system prevent a user from entering 
600, or should the system accept it and give feedback to the user saying 
that the acceptable inputs are 10-500?

 - Richard Dalton