An overview of innovations in the external peer review of journal manuscripts.

Background: There are currently numerous innovations in peer review and quality assurance in scholarly publishing. The Research on Research Institute conducted a programme of co-produced projects investigating these innovations. This literature review was part of one such project 'Experiments in peer review' which created an inventory and framework of peer review innovations. The aim of this literature review was to aid the development of the inventory by identifying innovations in the external peer review of journal manuscripts reported in the scholarly literature and by providing a summary of the different approaches. This did not include interventions in editorial processes. Methods: This review of reviews is based on data identified from Web of Science and Scopus limited from 2010 to 2021. A total of 291 records were screened, with six review articles chosen for the focus of the literature review. Items were selected that described approaches to innovating peer review or illustrated examples.   Results: The overview of innovations are drawn from six review articles. The innovations are divided into three high-level categories: approaches to peer review, reviewer focussed initiatives and technology to support peer review with sub-categories of results presented in tabular form and summarised. A summary of all innovations found is also presented. Conclusions: From a simple synthesis of the review authors' conclusions, three key messages are presented: observations on current practice; authors' views on the implications of innovations in peer review; and calls for action in peer review research and practice.