Smashing Magazine: 10 Designer’s Checkpoints To Be Aware Of

http://www.smashingmagazine.com/2007/08/10/10-designers-checkpoints-to-be-aware-of/
"Automatic tests, checks and analysis services can be extremely valuable if you’re looking for bugs or try to avoid them. To make sure everything is just the way you think it should be, you need validators. To improve the value and quality of your content, you need to be able to analyze the behaviour of your visitors. And to perform better in the future you have to know exactly, what your competitors are doing, how they’re doing it and what you should learn from them."