All BA's know that drawing out the important requirements for a project is critical. The process, to me, is a lot like what I have been exposed to through outdoor emergency care and first responder training. I spent a ski season working with my local NSP chapter, and have experience in the triage process. From my many queries on the net, it seems that this is a comparison that other BA's have used before, but I think it helps to clarify how significant requirements elicitation really is.
Triage can be defined as the sorting of 2 or more patients based on how severe their injuries and conditions are and to prioritize medical attention. When you are first on the scene, you must pull from all of your past experience and knowledge to assess the situation, ask the right questions, assign crews, report priority of medical attention, and so on.
As described by Alan Davis in an article he wrote entitled "The Art of Requirements Triage", choosing which requirements to prioritize during the elicitation process is very similar to triage in the medical profession. In a disaster, three groups of patients are identified; those beyond saving, those who don't need saving, and those who do need saving. Comparing that to the elicitation process we must determine which requirements must be satisfied, need not be satisified, and should be satisfied but for which there might not be sufficient resources to accomplish.
Here are a few links that I have found helpful to me:
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