I can understand that making analogies is a very powerful form of explaining a hard concept, but you should be aware of the demons you might be unleashing. I like analogies, as much as anyone. I do the Einstein-Train-Thing to convince my self that I understand relativity like the next man. But everybody is careful talking about relativity and nobody would walk outside the framing without considering it very carefully. Software on the other hand is not so respected, and I ask you: does the next man really get it? Everybody can relate to cars, right? So that is a good reason to use the analogy, you would think , but here is where I have to disagree: Thinking you know about the domain, sells, production lines, marketing, resourcing, electronics, hydraulics and all the engineering that has been put into the car is the first mistake. The second mistake is assuming other people do (unless they work for BMW or something like that). You think you are making the software