Avoiding edge cases, aka better planning

Ben Henick nails it with a new article at A List Apart: Avoid Edge Cases by Designing Up Front. The tone-setter:

"In the absence of careful pre-design preparation, site builders are powerless to stop designers (and other team members) from demanding an endless stream of tweaks and exceptions that will invariably result in needlessly convoluted markup and style sheets."

This article lays out several basic site/application planning steps, then circumstances when additional steps are required, then how to apply those extra steps. If you're trying to get your arms around Web product development methods -- aren't we all? -- it's very useful information.