Tips and guidelines for being a good peer reviewer

Publication is the key means by which science spreads. The purpose of scientific journals is to publish novel and quality articles. The editors of the journals evaluate the content of the manuscripts by submitting them to a process called «peer review», considered today the gold standard to guarantee the adequate publication of scientific articles. A well-crafted and critical peer-review report is a treasure for both authors and editors. In the present manuscript we will examine the key aspects of the peer review process. We will begin by explaining what exactly this process consists of and since when it has existed, and then clarifying why it is so important. Then we will argue why we should want to be reviewers of scientific papers. We will then review what are the fundamental rules to carry out a good review of a manuscript and what aspects of it we should focus on. Later we will see what format a peer review report should have and how to write its different sections, as well as the options for its final resolution. We will pay special attention to commenting on the ethical aspects and the most frequent errors that are made in the evaluation of manuscripts. Finally, we will recognize what the fundamental limitations of peer review are, and we will end by proposing some suggestions for their improvement. Our ultimate goal is to stimulate researchers -and authors- to go one step further and undertake the challenge of being peer reviewers of scientific manuscripts.