Zertifikat Deutsch

The Zertifikat Deutsch (ZD) is an internationally recognized exam of German language ability. It tests for a level of ability equivalent to level B1 in the Common European Framework of Reference for Languages (CEFR) scale. Candidates typically need between 300 and 600 hours of instruction in German in order to obtain the necessary fluency to pass the "Zertifikat Deutsch" exam.
Some organizations have changed the name of this exam, for example the Goethe-Institut, which has called it "Goethe-Zertifikat B1" since May 2013, but others still use the original name.
The "Zertifikat Deutsch" exam is tailored to the needs of adult students of German, regardless of whether they are inside or outside a German-speaking country. Another exam, the "Zertifikat Deutsch für Jugendliche" (ZD j), is tailored to adolescent students of German.
The "Zertifikat Deutsch" is the result of a joint collaboration between the Goethe Institute, the Österreichisches Sprachdiplom (ÖSD), the Schweizer Erziehungsdirektorenkonferenz (EDK) and WBT Weiterbildungs-Testsysteme gGmbH, later renamed telc GmbH (i.e.The European Language Certificates).