Thomas Vander Wal writes in Designing with a Solution is the Problem: "... a designer at Ford, Giuseppe Delena, ... would say, 'Don't tell me you need a bridge, show me the canyon!' This was aimed at marketing people who would ask for specific design solutions, but not explain the problem. That is my tipping point. Having to start with somebody's solution to design problems (most often solutions to the wrong problem). Not having the problems put forward, but an answer. An answer without anybody showing their work to how their arrived at the solution."This doesn't just apply to web design. I've seen it in designing network infrastructures and business processes, and wouldn't be surprised if it applies pretty much anywhere any sort of system is being built.
(Via Off the Top.)