“Usability cost-benefit data shows that including usability in product development actually cuts the time to market and increases sales because usability and ease of use build quality into products and catch many expensive problems early on in the cycle when they can be addressed at lower cost. Finally, working with users from the beginning of a product cycle ensures that the product is being designed so that users will be satisfied.”
- Claire Marie Karat, “A business case approach to usability cost justification.” In, R. Bias and D. Mayhew, Eds. [Cost-Justifying Usability->http://www.amazon.com/exec/obidos/tg/detail/-/0120958112/], Academic Press, NY, 1994.