GamesIndustry.biz - Console Gamers Aren't PC Gamers. By Byron Atkinson-Jones (Introversion).
The key thing here is that the control scheme appears to work for us - up till this point nobody but the developers have had a chance to play with it. Since the controls tend to be put into place rather early on, the developer gets quickly acclimatised to his chosen control scheme and it's easy to become convinced that what we have now is actually a very good system and therefore best left alone. This introverted approach to playtesting also backfired for us with Darwinia+ - just before we entered into the Code Complete phase of the project our account manager at Microsoft expressed some concerns over the control scheme we had in place. Our problem was one of coherence between Darwinia and Multiwinia and also the fact that our control scheme made use of context sensitivity which meant that controls had meanings based on the current action.