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Generalized net models of different queueing disciplines in queueing systems are proposed in [11]. In the present paper, we propose modifications of these models including Intuitionistic Fuzzy Pairs (IFP) and Interval-Valued Intuitionistic Fuzzy Pairs (IVIFP) which determine the way in which the requests are serviced. In each of the models, the buffer has finite capacity and is represented by two Generalized net transitions. The buffer cells are represented by places of the net. The two simple queueing disciplines considered are FIFO and LIFO. A more general model with IFP (or IVIFP) in which the requests can change their parameters and position within the buffer is also proposed.

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.

The object of this article is to discuss some problems, that hav low vision developers using some frequently use rapid application development environments. Particular attention is payd to those of them, that have free versions or are use by high schools and special secondary schools. Accessibility level of main menu, submenus, settings dialog boxes, text edit tools, diagnostic and debugging addressed interface are measure. Made reference, that summary accessibility level of development environment DEV-C++ does not allow effective work by using screen readers and braille displays. As better is estimated accessibility level of Microsoft Visual Studio, but, mention may here be made of some important components (related to creating GUI and database projects) are fully inaccessible. So, blind developer can without somebody else help create console applications only. Development environment C++ Builder is closely discussed, because by working with it using screen readers and braille displays problems mentioned before does not exist. The circumstance, that this development environment is out-of-date, is not omitted, so it have not any contrivances to develop 64 bit applications and applications for Android. The article says, that software tools for developers has low level of accessibility, then applications addressed to generally use.

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