Virtual learning environments are commonly adopted by universitiesas classroom teaching support. One of the resources they offerare class presentations, usually in PDF files. Considering that webaccessibility is essential to allow users with some limitations tounderstand, interact, operate and navigate web content, this articlepresents an assessment of the accessibility of PDF documents madeavailable on Moodle. The methodology used a hybrid approachcomprised techniques and practices for assessing human-computerinteraction and assessing accessibility with users simulating blindness.A quantitative analysis of the data was carried out consideringthe accessibility problems faced by users in elements such as tables,graphs, mathematical formulas, expressions in foreign languagesand presentation topics. The results indicated accessibility problemsin all documents in the sample, even causing users to drop outduring the evaluations.

Semantic relations in knowledge representation characterizes the association between the concepts of a domain. Concepts are units of knowledge and the relationships that link these units, which gives meaning to the knowledge as represented. In this way, semantic relations allow users to assimilate the purpose of the association between concepts in the presentational context, avoiding misinterpretation of the information, mainly that presented in instruments of knowledge representation.The objective of this paper is to propose a taxonomy of semantic relations that compiles the different approaches on the subject. The methodology applied bibliographic research for theoretical foundation and literature review based on the main bibliographic references on semantic relations. As result, some classifications of semantic relations were found to have been raised by different authors, each offering a singular point of view, which has resulted in a range of discordant terms. To answer this need, a taxonomy was arrived at of sixty-three semantic relations, including a new relation discovered by this study, dubbed here ‘subordinate agent’.

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A revolução tecnológica tem promovido a disseminação da informação cada vez mais precisa e rápida, além de se tornar um importante meio de negócio, educação e entretenimento. Porém, problemas relacionados à acessibilidade do conteúdo tem sido um fator preponderante para a exclusão de pessoas com deficiência. Neste contexto, este mini-curso pretende explorar elementos de acessibilidade de sistemas de software e, principalmente, as atividades que uma organização deve cumprir para ainstitucionalização da acessibilidade.