Scenario-Based Architecture Evaluation Methods

I'm a fan of scenarios.  Whether you use scenarios for scenario-driven development,  scenario-based evaluations, competitive assessments or for shaping products ...  scenarios are where the rubber meets the road.  I think scenarios are particularly effective for evaluating architectures and for making architecture trade-off decisions.  I wrote a short post on Shaping Software that reiterates a mantra I frequently use ... you can't evaluate architecture in a vacuum.