5 questions posing human-computer communication challenges for interaction design: Nick Nova suggests that “each of these issues can provide ’the beginnings for a systematic approach to the design of interactive systems’.”

Source: Bellotti, V., Back, M., Edwards, W.K., Grinter, R.E., Henderson, A., and Lopes, C. Making sense of sensing systems: five questions for designers and researchers. In CHI, 2002, 415–422.