There is no agreed upon list of criteria that a journal must meet in order to be called a "predatory publisher." It is a somewhat subjective term. Jeffrey Beall, creator of the Beall's list, describes predatory publishing as:
"Predatory open-access publishers are those that unprofessionally exploit the gold open-access model for their own profit. That is to say, they operate as scholarly vanity presses and publish articles in exchange for the author fee. They are characterized by various levels of deception and lack of transparency in their operations. For examples, some publishers may misrepresent their location, stating New York instead of Nigeria, or they may claim a stringent peer-review where none really exists."
However, Monica Berger and Jill Cirasella, both librarians at City University of New York, would like to remind researchers that:
"Quality and reputation are independent of openness, that OA journals do not necessarily charge fees, and that fees do not necessarily imply predatoriness."
There are many high quality OA journals out there. It is a matter of doing your research to ensure you are publishing with the right one.
Journal Hijacking: Where a unaffiliated 3rd party creates a sham website for a legitimate journal in order to scam people looking to publish their paper.
These lists were created by Prof. Jeffrey Beall, a University of Colorada Denver librarian. They contain potential predatory publishers. While some are critical of these lists, it is a good starting point.
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