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[log in to unmask] writes: >Chris, >Requirements belong to the categories of goals and objectives, and are not >subjected to the truth test. They are formulated by humans. I see that I may have confused the issue with terminology. I thought I might but couldn't think of a better word. When I say requirements I mean the "formula" for human powered flight. I do not mean set of requirements which are predetermined in order to manage a design activity so much as the specific and minutely detailed recipe which the designers struggled towards and which, once it was complete, enabled one man to fly across the English Channel entirely under his own power with no further interventions. However I would suggest that the simpler idea of requirements, ie the goals of a design activity, might well be the outcome of a research activity and be demonstrably "true" in their context. Thank you Lubomir for being patient, clear and helpful as ever. regards Chris Rust %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%