The doctoral disertation analyses the habits and requirements of intergenerational families in the use of digital solutions and the possible synthesis of the concept of family-centred development, characterised by inclusiveness and benefits for all generations of users. The domain-oriented development of digital solutions has revealed the complexity of the behaviours and needs of the target groups, which have been analysed using standard research methods and design techniques in the field of user-centred design (UCD), extended by the concept developed, which has been named family-centred design. In the course of the development of the family-centred development concept, a wide range of methods were systematically applied, comprising various activities related to the conceptualisation, iterative development and testing of prototype user interfaces in a laboratory environment, as well as the evaluation of existing and adapted user interfaces for public digital services among the general population of Internet users, using a purpose-developed platform for unmoderated remote testing. An important contribution in the context of family-centred development was the development of instruments for measuring selected parameters and tools for assessing the compliance of web interfaces with established guidelines and technical conventions in the field of web accessibility. All procedures and results were documented in the three included scientific papers which were published in August 2018, March 2019 and July 2021 in MDPI Sensors journal with impact factor 3.576 (December 2021).
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