A Cost-benefit Evaluation of Accessibility Testing in Agile Software Development

Accessibility testing in software development is testing the software to ensure that it is usable by as many people as possible, independent of their capabilities. Few guidelines exist on how to include accessibility testing in an agile process, and how to select testing methods from a cost-benefit point of view. The end result is that many development teams do not include accessibility testing, since they do not know how to prioritize the different testing methods within a tight budget. In this paper, we present an evaluation of four accessibility testing methods that fits in an agile software development process. We discuss the cost of each method with regards to resources and knowledge requirements, and based on a cost-benefit analysis, we present the optimal combinations of these methods in terms of cost and issues discovered. Finally, we describe how accessibility testing methods can be incorporated into an agile process by using the agile accessibility spiral.