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Heuristic evaluation (Nielsen and Molich, 1990; Nielsen 1994) is a usability engineering method for finding the usability problems in a user interface design so that they can be attended to as part of an iterative design process. Heuristic evaluation involves having a small set of evaluators examine the interface and judge its compliance with recognized usability principles (the "heuristics").

Not-for-profit, charity, non-governmental organization (NGO) . . . most of the names emphasize what these organizations are NOT. And when we study .org websites, it's obvious that they differ from the clear value proposition offered by commercial websites. Typically, you visit sites because (a) you like what they have and (b) you'll pay money to get it. Not so with non-profit sites. Non-profits must clearly communicate their value proposition if they want to attract volunteers and online donations. Sadly, such communication is the sore point in the non-profit user experience.

useit.com: Jakob Nielsen's Website Jakob's column on Web usability