Post #790296

The problem of upfront specifications is that the world is more complex than you are, and it may change between the point of specification authorship and the point of software delivery. Even if the archetypal “panel of experts” creates the specification there will be gaps, things which just don't work, or aspects of the specification which are contradictory in practice. The perfect, toy world of your imagination is never the same thing as the actual messy and changing real world beyond your cognitorium.