Open to all, there is no time limit on the validity of the CLES certification.

The CLES certification is available in nine languages: German, English, Spanish, Italian, Arabic, Modern Greek, Polish, Portuguese and Russian, and at three levels: B1, B2 and C1.


  • CLES B1 certifies the learner’s ability to deal with most situations likely to arise whilst travelling in an area where the language is spoken.
  • CLES B2 certifies the learner’s ability to synthesize information and present points of view on subjects relevant to a mission that is connected to the working world and involves solving a problem and reaching a compromise.
  • CLES C1 certifies the learner’s ability to communicate within his/her scientific or professional community.
Published on  July 24, 2017
Updated on May 14, 2020