Game Transparency, By Andy Collins - in Dragon 375
Excerpt:
"Game transparency" is the amount of purely game information that's shared between the DM and players. Even
DMs who understand the value of game transparency can struggle with the right balance of information-sharing and secrecy. When is the right time to tell the players what's happening? A little opacity can maintain the illusion of believability; after all, it's not like the characters are omniscient entities. What's more, limiting information keeps the game playable. Not only is there no good reason for characters to have detailed information about monster statistics, such details can distract players from more important concerns. ...
Although it’s true that
part of the fun of D&D is not knowing exactly what’s
going to happen next, too much of that reduces the
value of decision-making by the players. After all, why
bother strategizing for a battle if the results of your
actions appear random?
Players without sufficient transparency quickly
grow bored or conclude that they have no reason to
pick one tactic over another. Artful combinations of
monster powers and weaknesses are ignored. Combats
turn into mindless, identical grinds of “attack
roll, damage roll, who’s next?”
Thus, you need to inject some level of transparency,
even beyond what the rules already provide.
Sure, players know that flanking provides combat
advantage. But do they know that those flanking goblins
also deal extra damage, or do they just assume
that you got a lucky damage roll? For the player to
make an informed decision, it’s best to let them know
what’s happening.
http://www.wizards.com/default.asp?x=dnd/drfe/20090508