In January 2014, a new EU programme for education, training, youth and sport for the period 2014-2020, called Erasmus+, was launched. Specific objectives of the programme include language learning and linguistic diversity. Online Linguistic Support (OLS) supports language learning for Erasmus+ mobility participants under Erasmus+ programme. OLS support provides long-term mobility participants under Erasmus+ programme (Key Action 1) with the opportunity to assess their foreign language skills to study, work or volunteer abroad. In addition, online language courses are available for selected participants to improve their competences. The use of OLS for the purpose of assessing the level of knowledge is from the second semester of the academic year 2014/15 further compulsory for all students who will use one of the languages offered by the online tool as their main working language in their studies and practice in the host countries, namely: CS, DA, DE, EL, EN, ES, FR, IT, NL, PL, PT and SV.