>Why and What are important, but they are limited in possibility by the How Very well said! This is why we do trial-and-error, proof-of-concept, prototyping e

>Why and What are important, but they are limited in possibility by the How Very well said! This is why we do trial-and-error, proof-of-concept, prototyping etc. In general, you have to play with the "How" a little bit before the "Why" and "What" become clearer and you can nail them down as actual "Requirements". All three are interlinked and cannot be looked at in isolation.