Design principle: Take things away until the design breaks, then put that last thing back in.
Alan CooperPast dreams of bliss our lives contain, And slight the chords that still retain A heart estranged to joys again, To scenes by memory's silver chain Close-linked, and ever yet apart, That like the vine, whose tendrils young Around some fostering branch have clung, Grown with its growth, as tho' it sprung From one united heart.
Alan CooperTo our human minds, computers behave less like rocks and trees than they do like humans, so we unconsciously treat them like people.... In other words, humans have special instincts that tell them how to behave around other sentient beings, and as soon as any object exhibits sufficient cognitive function, those instincts kick in and we react as though we were interacting with another sentient human being.
Alan CooperA powerful tool in the early stages of developing scenarios is to pretend the interface is magic. If your persona has goals and the product has magical powers to meet them, how simple could the interaction be? This kind of thinking is useful to help designers look outside the box.
Alan Cooper