There are not different kinds of OA. There are, however, different meeting formats such as:
- HOW (Honesty, Open Mindedness & Willingness)
- Big Book Study
- Literature Discussion
In Unity Intergroup publications and communications, Overeaters Anonymous will always be referred to as OA. If distinctions are wanted or needed they should refer to meeting descriptors or meeting formats. Meeting descriptors would be the day, time, location or group name (i.e., a meeting could be referred to as the Tuesday morning HOW Meeting, or the Tuesday Minneapolis Meeting).