 Judah's work in the Mishnah appears both in what he included and in what he rejected.The volume of tannaitic statements not included in the Mishna (but recorded in the Tosefta and in the baraitot of both Talmuds) shows that Judah had no small task in selecting the material that he included in his work.Also, the formulating of halakic maxims on controverted points required both his unusual technical knowledge and his undisputed authority; and the fact that he did not invariably lay down the rule, but always admitted divergent opinions and traditions both of the pre-Hadrianic time and, more especially, of Akiba's eminent students, demonstrates his circumspection and his consciousness of the limits imposed upon his authority by tradition and by its recognized representatives.