QUOTE (Titanhex @ Mar 18 2011, 12:12 PM)

He speaks the truth. :X
QA typically can be achieved with a number of volunteers known as Beta-Testers, who know it's their sole responsibility to find and report bugs in a very clear fashion. They must test every aspect of the game and try their hardest to break the game and find exploits. It is a VERY tedious and boring job, and takes up a lot of time.
The best way to achieve a good beta-test is to provide Beta-Testing tools in your game. Dungeons: Critical Hit! does a good job of this by giving you an F-9 key that lets you set the variables and switches, lets you teleport to any map, allows you to have any item etc.
As far as I know, Beta-Testing has been the only way to approach QA.
This. I also play through it several times and try to find any errors.