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Streszczenie. Niniejsza publikacja przedstawia rezultaty analizy porównawczej języków programowania Java i Kotlin, wykorzystywanych do tworzenia aplikacji mobilnych przeznaczonych do pracy pod kontrolą systemu Android. Analiza obejmuje aspekty związane z wydajnością, takie jak obciążenie procesora, obciążenie pamięci RAM, a także czasy kompilacji i wykonania programu. Pod uwagę wzięto również strukturę kodu, dostępność bibliotek, obsługiwane bazy danych, popularność oraz wsparcie społeczności.Abstract. This publication presents the results of a comparative analysis of Java and Kotlin programming languages used to create mobile applications for system Android. The analysis covers performance aspects such as CPU load, RAM load, as well as the compilation and execution times. Aspects such as code structure, availability of libraries, supported databases, popularity and community support were taken under consolidation.

The Internet is transforming into the main source of information. Standards are being developed so that people with different types of disabilities are not to feel excluded. Tools based on certain standards automate tasks, but they are also important to work correctly. The study consisted of checking the pages with selected tools discussed in the literature dealing with website accessibility. The validators are identically configured each time the website verifies compliance with the WCAG 2.1 standard. The number of errors detected per page varies significantly when using individual tools. The error rate calculated for the number of all HTML elements of the page ranges between less than 1% and 80%. It is not possible to unambiguously select the worst service on the basis of analyzing all results obtained, it can be a different service for each tool. The tools automate the activities of verifying availability. Each of the validators tested found errors, some of the same. The best solution is not to rely on just one tool, because the results obtained can relate to completely different elements of the page. It all depends on the care of the creators in the preparation of the tool and their care for compliance with standards.

This article discusses the implementation of projected changes in the Polish course tertiary education at Computer Science/Information Technology faculties. The project aims at enabling the students to get educated and skilled in view of their prospective IT employers' demands and expectations, and enhancing their offer's attractiveness in the labour market. This is being carried out through cooperation and collaboration with IT businesses for preparation and delivery of targeted education, and through inclusion in the syllabuses of research conducted at the Lublin University of Technology.