Hmmm... I think there are lots of different ways of approaching this... my thinking was more theoretical in terms of how to actually do the formal assessment of a design, rather than the comparative assessment of a specific build v another specific build. Don't get me wrong there's a lot to be said for the crowd view but there's always some subjective opinion. I think the issue raised by DC is one of "with all the helpful but diverse input how does he make a reasoned assessment, what are the basic parameters he needs to understand", at least in sufficient detail to get a feel for things, and, IMHO, that needs an element of the 'why' about it. For some people that could be intuitive, they can look at something and see how it might behave, others need to see the numbers and yet others need pictures...