How Do We Learn Complicated Tools?
People accumulate experience, develop intuitions, learn, and reason, so we can “figure out” how to use some tools without reading the owner’s manual (e.g. portable CD player)
Product designers – including software designers -- try to make technology simple enough that members of a technological society can guess its operation using only their experience, intuition, prior knowledge, and reasoning
Well-designed tools suggest their use and how to use them.