Digital technologies occupy an important place in today’s developing world. They are also strongly related to new trends in educational technologies. In this context, the digital accessibility of this new environment for people with various special needs is of particular concern. A novel tool for assessment of the technological ecosystem, designed to provide digital accessibility to people with special needs, is described in the paper. The overall structure and the initial test of the system are discussed in the paper. The conceptual framework of the ecosystem and its ontological model are described. Special attention is paid to the accessibility of digital learning and e-learning for people with special needs from a robotic perspective.

Computer models for self-preparation for a game with mathematical dominoes Axes of Symmetry are presented, which also has the role of an educational resource on Symmetry. A computer model has been developed, in which the multiplicity of rotational symmetry is automatically and randomly generated, which is used to obtain each of the figures on the domino plates. The freely available electronic resources are developed with dynamic GeoGebra software and are provided in the Virtual Mathematics Laboratory, developed at the Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences.

Symmetry: Culture and Science (ISSN 0865-4824) - Online

A system of tasks for counting isosceles trapezoids and 3D auxiliary models for them is presented. Steps for working with the 3D printed manipulatives during independent work, expected errors in counting the specific geometric figures, and ways to rationalize the counting by symmetry are described. Options for creating the auxiliary files using the XYZmaker3Dkit software product are considered.