1. Artman, H.: Procurer usability requirements negotiations in contract development. In: Bertelsen, O.W., Bødker, S., Kuutti, K. (eds.) Human-Computer Interaction. Proc. 2nd Nordic Conference, pp. 61–70. ACM Press, New York (2002)
2. Asaro, P.: Transforming Society by Transforming Technology: the science and politics of participatory design. Accounting, Management and Information Technologies 10(4), 257–290 (2000)
3. Aucella, A.: Ensuring Success with Usability Engineering. Interactions (May + June 19–22, 1997)
4. Bevan, N.: Cost Benefit Analysis version 1.1. Trial Usability Maturity Process. Serco Usability Services (2000)
5. Bias, R., Mayhew, D.: Cost-Justifying Usability. Academic Press, Boston (1994)