Each of us makes assumptions continually in a typical day andmany of them are hidden. Clearly this is an important potentialobstacle of clear or critical thinking. Stephen Covey recognizedthis when he said We simply assume that the way we see things isthe way they really are or the way they should be. And ourattitudes and behaviors grow out of these (ThinkExist.com).Marshall McLuhan called us to an ongoing review of our assumptions:Most of our assumptions have outlived their usefulness(ThinkExist.com).