Consensus decision-making or consensus process is a group decision-making process in which participants develop and decide on proposals with the goal of achieving broad acceptance, defined by its terms as form of consensus. The focus on establishing agreement of at least the majority or the supermajority and avoiding unproductive opinion differentiates consensus from unanimity, which requires all participants to support a decision. Consensus decision-making in a democracy is consensus democracy.

An affinity group is a group formed around a shared interest or common goal, to which individuals formally or informally belong. Affinity groups are generally precluded from being under the aegis of any governmental agency, and their purposes must be primarily non-commercial. Examples of affinity groups include private social clubs, fraternities, writing or reading circles, hobby clubs, and groups engaged in political activism.