 This entry refers to the set of individuals participating in the decision as the group or (decision) body, and to the larger set from which this group is selected as the population. Examples are electoral bodies selected from the population of citizens, and scientific advisory bodies selected from the population of scientists. In real life, some decision bodies are very large: electoral bodies often contain millions of citizens. Other bodies have medium size: juries in court often involve 12 members. Yet other bodies have few or just one member: authoritarian states are ruled by small cliques or just one person.