Below are listed some additional studies on usability and return on investment. We welcome your feedback for additions to this list.
John S. Rhodes wrote a column for Webboard.com that is a comprehensive and well-laid out marketing summary for how usability testing is actually cost-effective: Usability Can Save Your Company
Randolph G. Bias (ed. Deborah Mayhew) wrote one of the most widely read books on the cost/benefit analysis of usability testing called, Cost-Justifying Usability
