Reviewers should be professional, representative, and diverse. They should have strong academic competence in the field to which the manuscript is submitted. For example, a Ph.D. degree. Competent reviewers must have a deep understanding of their assigned area of expertise and some review experience. They will be able to identify unnoticeable errors in a paper's dataset or detect subtle novelties. The reviewer base should be as comprehensive as possible. (Typically, each submission is reviewed by at least three reviewers or more.)
A qualified peer-reviewer typically is:
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Qualified to Ph.D. level or above in the relevant area.
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Possesses the necessary expertise and experience to assess the paper.
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Capable of formulating an unbiased, impartial, and timely review report
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Has a good publication history.