This page concerns the WikiProject-associated peer review process. This process was where articles received a peer review from other Wikipedians from a specific WikiProject. Usually, a separate page of the WikiProject existed to store new and old review requests. A list of WikiProjects that participated is here: Category:WikiProject peer reviews
This was most popular in the years 2006 - 2007, before Wikipedia's central peer review process gained popularity. Wikiproject-associated peer reviews became less and less active through until 2010, with only a handful of reviews after this date. Because of this, unfortunately many reviews were not visible to most editors and therefore went unanswered.
Since that time Wikipedia's central peer review process has seen over over ten thousand reviews. Article alerts are used by many WikiProjects to display active peer reviews from this process, amongst many other things.
By 2020, Wikiproject-associated peer review pages were inactive, had never been used, or simply pointed to the central peer review process. An effort was made to update and standardise those pages at that point.