During the peer review process, the quality of research and research results cited in a scientific paper will be evaluated. Once a paper is submitted to a journal, reviewers will often request that the authors make changes. After suggested changes have been made, publishers then send the submitted paper to other scientists, who read and critique it to ensure that the paper describes good quality research. If the paper passes the review process, it is then published as a research article. For chemists, peer-reviewed journal articles are key sources of scientific information.