a paper submitted for publication in a peer-reviewed journal is examined by other scientists in the field .
Three drafts of his report were peer reviewed before it was accepted for publication.
Peer review happens in two ways. In one method, a paper submitted for publication in a peer-reviewed journal is examined by other scientists in the field before an editor (usually an expert in the field) passes judgment on it. The second method is review by an independent panel of experts who, using rigorous criteria, determine whether the findings of the paper are credible.