Classically, there were only three professions: Divinity, Medicine, and Law. The main milestones which mark an occupation being identified as a profession are:
- It became a full-time occupation;
- The first training school was established;
- The first university school was established;
- The first local association was established;
- The first national association was established;
- The codes of professional ethics were introduced;
- State licensing laws were established.
