We believe the traditional peer review model, whereby an editor invites two or three reviewers to review a manuscript, is not suitable for books. Reviewing a book takes a lot of time (compared to reviewing a journal article, for which this model was developed), which makes it very hard to find suitable reviewers. Moreover, this process is largely a black box, and quality control cannot be guaranteed.
At Aldus Press, we have developed an open peer review (OPR) process because we believe this is the most transparent, effective way for readers to validate the quality and relevance of our books, which is the primary goal of peer review. Prior to publication, authors solicit reviews of their work from their peers. Aldus validates the identities of these reviewers. Their names and affiliations (including their ORCID iDs) as well as the reviews are published in the book itself and included in the metadata. Based on the reputations and endorsements of these reviewers, readers will be able to assess the work quickly and accurately.