Self-Archive: Make work accessible on a personal website of non-commercial repository. This work can be pre/postprint or final.
Green: Green open access (OA) refers to the practice of making postprint or the final peer-reviewed manuscript of a research article freely available online through a repository or other website.
Self-archived and green are sometimes used interchangeably and sometimes differ with the definitions above. For both, when a journal's default agreement does not permit self-archiving, many authors are able to negotiate to retain that right. Often, this agreement includes an embargo period where the work is only available in subscription form before it can be deposited in a freely accessible repository/website.
Hybrid Open Access: Hybrid OA encompasses a blend of subscription-based and open access articles within the same journal. Authors, in this case, have the option to pay an article processing charge to make their individual contribution freely available, even if the rest of the journal's content remains under subscription. This model addresses the gradual transition from traditional to open access publishing.
Gold Open Access: Gold OA entails the direct funding of research publication through an upfront payment made by the authors or their affiliated institutions. In this model, the research output is made freely accessible to the public, mitigating the need for subscriptions or paywalls.
Diamond Open Access: Diamond OA centers on non-commercial, community-driven support for open access publication. In this model, the costs of publishing are borne by institutions, organizations, or volunteers, eliminating the need for author or reader fees.
Platinum Open Access: Platinum OA is characterized by the absence of author-facing fees while ensuring free access for readers as well. In this fully open model, expenses related to publication are typically covered by academic institutions, libraries, or funding bodies, emphasizing an inclusive dissemination strategy without economic barriers.
