Expert
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An expert is somebody who has a broad and deep understanding and competence in terms of knowledge, skill, and experience in a particular field or area of study, derived from both practice and educatio
Adolf von Becker: The Art Expert
Peer group
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In sociology, a peer group is both a social group and a primary group of people who have similar interests, age, background, or social status. Members of peer groups are likely to influence each other
Expert
…recognized as a reliable source of technique or skill whose faculty for judging or deciding rightly, justly, or wisely is accorded authority and status by peers or the public in a specific well-distinguished domain. An expert, more generally, is a person with extensive knowledge or ability based on research…
Early childhood peers engaged in parallel play
A group of children playing together in Bolivia