How many ATD communities of practice are there? KB Admin, ATD Updated October 14, 2016 19:23 Follow There are currently 11 communities; these communities may change as the needs of the profession change. Related articles How do I set my community of practice preferences? What is a community of practice? What are the benefits to joining an ATD community of practice? Do I have to be an ATD member to join a community of practice? How much does it cost to join a community in addition to the ones that come with my membership?