This paper presents the results of ongoing research on methods for evaluating the accessibility conformance level of software and especially operating systems. Our approach is based on recommendations from software accessibility standards, and defines techniques for evaluating each of those recommendations. The proposed method has been applied to evaluate the accessibility features of one closed-source and one open-source desktop operating system, Microsoft Windows XP and the Ubuntu Linux distribution, respectively. Specifically, the functionality we have evaluated was task management and file system management. From the point of view of the evaluation process, we conclude that more work is needed on the development of support tools and techniques. And from the point of view of the specific comparison, we conclude that, taking into account the analysed functionality, the current version of the Ubuntu Linux distribution is slightly more accessible than the current Windows release, though neither of the systems fully conform to the accessibility standards.
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