Linguistic and cultural mediators, such as translators, interpreters, and language teachers, need complex and well-developed language skills in all the languages they work with. In this study, we examine the connections and correlations among the following skills: reading literacy in native language, reading literacy in foreign language, problem solving and translation. Three of these skills (reading in native and foreign language and problem solving) are evaluated on a three-level scale based on the three cognitive processes used in Programme for International Student Assessment (PISA) assessments (location of information, understanding, evaluation and reflection) (Organisation for Economic Co-operation and Development – OECD 2018). The methodology of measuring reading comprehension in native language and problem-solving skills has already been developed and applied by our research group (