Group decision making has more complete information than individual decision making. The saying “two heads are better than one” is often true. When people in a group are trying to make a decision together, the diversity of experience and perspectives of people in the group will help to make a better decision. Groups also generate more alternatives than individuals, thanks to the greater quantity and diversity of information they have.
Group decision making is consistent with democratic ideals. Decisions made by groups may be perceived as more legitimate than the ones made by a single person.