The Court of Cassation ("Cour de Cassation") is the highest court and the only national court on civil and criminal matters. It has six chambers, five civil chambers: (i) on contract, (ii) on delict, (iii) on family matters, (iv) on commercial matters, (v) on social matters: labour and social security law; and (vi) on criminal law. The court has 85 "conseillers", 39 junior "conseillers réferendaires", and 18 trainee "auditeurs." It typically hears cases in three or five judge panels. A "chambre mixte" (a large panel of senior judges) or plenary session ("Assemblée plénière") can convoke to resolve conflicts or hear important cases. In 2005, it decided over 26,000 cases. The Court of Cassation also gives advisory opinions on the law on reference from lower courts.