Silence like a cancer grows “Fools,” said I, “You do not know Silence like a cancer grows Hear my words that I might teach you Take my arms that I might reach you” But my words like silent raindrops fell And echoed in the wells of silence Paul Simon & Art Garfunkel, The Sound Of Silence silencediseaserain
What's wrong with the rational model We Don’t Really Know the Goal When We Start We Usually Don’t Know the Decision Tree – We Discover It as We Go The Nodes Are Really Not Design Decisions, but Tentative Complete Designs The Goodness Function Cannot be Evaluated Incrementally The Desiderata and Their Weightings Keep Changing The Constraints Keep Changing Frederick P. Brooks, Jr., What's Wrong With This Model? Changing constraintsDeciding what to designThe situation talks back