The software systems that millions of users use everyday around the world are mainly targeted at the main and the largest average group of people - people without disabilities. However, software systems are often inaccessible and unusable for another group of people - people with congenital or acquired disabilities. For a system to be accessible to people with special needs, it must be designed to take account of and be geared to their specific needs, opportunities for using the software systems and the hardware that provides them. This paper presents a model for creating a software system (for a physiological data analysis) that takes into account the needs of people with disabilities and in particular people with visual deficits. This model will ensure the assibilites of the software system and its easy use by both this target group and people without disabilities.

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New information technologies and accessibility technologies pose new challenges and opportunities to education. The main purpose of this study is to explore the basic principles that underlie affordable online learning. Accessibility is seen as an opportunity to include those participants who, for various reasons, lag behind the overall flow. The proposed basic principles could serve as a prerequisite for improving the quality of educational materials used.

The paper presents a major part of the research work of a team of scientists under project No. KP-06-Н42/4, funded by the National Institute for Scientific Research, concerning the analysis, evaluation, and improvement of digital accessibility for people with disabilities. The research aims to support accessibility for people with severe or total vision loss, as well as understanding the problems they face, and the ways to overcome them. This includes offering a methodology for assessment, analysis and evaluation of accessibility tested on more than 100 sites and documents. Software programmes were also reviewed for accessibility. The paper also includes examples offering more adequate digital presentations of information to people with disabilities. Examples include a site with accessibility and QR codes, a training site and a system with appropriate digital representation and encoding of information.