To assess the fit between a person and the used technology, human factors specialists or ergonomists consider the job (activity) being done and the demands on the user; the equipment used (its size, shape, and how appropriate it is for the task), and the information used (how it is presented, accessed, and changed).
Objavil je tudi več pomembnih del o statistični fiziki, kjer je uporabljal metode verjetnostnega računa, teorije informacij, teorije čakalnih vrst ("queueing theory") in analize.