A certificate, report, language diploma, or comparable proof must be submitted; the proof must contain information on the issuing institution, the level achieved, the assessment standard applied, and the date of issue or acceptance of the last examination performance.

The required language level can be demonstrated, for example, by means of a Goethe certificate or comparable proof.

Applicants whose native language is German can also prove that they meet the admission requirement by submitting official documents that show that the applicant learned the relevant language as a first language in early childhood without formal instruction and spent at least eight of the first twelve years of their life in a country in which the relevant language is used as an official language. Proof is deemed to have been provided in particular with the submission of a German university entrance qualification.