Woodcut of the monastery and the city of Sankt Gallen

1. Gratian began teaching canon law by using the case law method  (The Christopher Columbus Langdell of Bologna).  Gratian was the first jurist to use this methodology for an entire work. 2. He began teaching canon law in the early twelfth century as Adam Vetulani had conjectured fifty years ago.  His purpose: Teaching, teaching, teaching.
3. With the expansion of the Decretum in subsequent recensions Gratian attempted  to make his work a comprehensive source of canonical sources.

4. Gratian's "hypothetical" remains an important element of law school education through  the literary genre of  "Questiones."