This document provides an overview of how working groups and interest groups function within the Research Data Alliance (RDA). It explains that interest groups focus on a common interest defined in a short charter, while working groups have a more concrete problem, short timeframe, and expected output. It describes how to join, start, and adopt outcomes of groups. Current groups are also listed. The document uses a taxonomy to classify groups by discipline, function, and technical vs. non-technical focus. Informal relations between some current groups are noted.