Mardé Greeff, Louis Coetzee, Martin Pistorius. Usability evaluation of the South African National Accessibility Portal interactive voice response system. In Reinhardt Botha, Charmain Cilliers, editors, Proceedings of the 2008 Annual Conference of the South African Institute of Computer Scientists and Information Technologists on IT Research in Developing Countries, SAICSIT Conf. 2008, Wilderness, South Africa, October 6-8, 2008. Volume 338 of ACM International Conference Proceeding Series, pages 76-85, ACM, 2008. [doi]