Other languages can be offered on a temporary basis if there is a need. A secondary aim is the certification of competence in different languages. The CLL is responsible for the organisation of examinations and the certification of communicative competence in Luxembourgish. The certificates in Luxembourgish awarded by the Centre de Langues Luxembourg are endorsed by the Ministry of Education. No particular conditions, in terms of residence or course attendance, are placed upon registration.
Examinations take place twice a year.
This is done in recognition of the fact that Luxembourgish is above all a language of oral communication whose written use is more limited. As reading comprehension is considered to be of greater importance than written expression, these competences are tested and certificated separately. Candidates may choose to take only one or two components , or to take the components at different levels. However, the higher level IDL consists of four components , all of which must be attempted. All oral and written tests are based on materials related to social, economic and cultural topics.