J. Matthias Starck comprehensively guides the reader in this essential through all steps of writing an expert review for a scientific journal. It is built on a succinct analysis how science works, how science is communicated and how science is published. It provides a critical guide how to write good, informative and fair peer reviews. The author presents a critical discussion of different peer review procedures and their alternatives, explains ethical guidelines as well as the dark sides of scientific publishing. So this essential helps the reader to perform better in the existing system and to contribute to its further development and improvement.