In 2013, PLOS, and SPARC OASPA published a guide entitled "HowOpenIsIt. Open Access Spectrum" in which the range of components to define how open is a journal is based on the rights of readers, reuse rights, copyrights, automatic deposit services and interoperability between machines (machine-readable).

It is not the same a journal that is free immediately upon publication than one that its contents are available after 12 months. It is not the same a journal that uses open licenses than another that limits the re-use of its articles, e.g., for depositing in an open access institutional repository.

The guide can be used to assess which components define the "open" of a journal and to learn what makes a journal more open vs. less open, and to make decisions on where to publish according to the degree of openness.

These new aspects extend the concept of "open" and take into account the interoperability of the journal. This web service is a simple application that, through questions and answers, determines how open is a journal expressed as a percentage calculated from the scores assigned to the selected options from 0-4 (min -max). Thus, the higher journal is scored the more open it is.

The final result is a graph with relative percentages for any option and a total percentage which defines how open is the Journal in the terms of the open access spectrum

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Dulcinea, BuscaRepositorios y Melibea son productos del grupo de investigación "Acceso abierto a la ciencia". CSO2014-52830-P.