Miller's Law - and the 7 pieces of information in your head
Miller’s Law states as humans we are only capable of concentrating on only approximately seven chunks of information. A typical software artifact has far more than seven chunks of information we are therefore limited on our capability to handle the complexity of a software artifact.The stepwise refinement help us handle the Miller’s Law restriction on our human capabilities by concentrating on seven most important information and hold off or not think about other aspects or information until we need to address it.