| Summary: | © 2016 IEEE.In the field of Technology-enhanced Learning (TeL), social tagging has been applied to Learning Object Repositories (LORs) mainly as a means to offer an alternative way of classifying the LOs based on the tag vocabulary (i.e. the collection of tags created by the end-users of the LOs). Nevertheless, in order to be able to understand how a social tagging system performs and whether it can deliver the aforementioned goal, it is important to be able to investigate the behaviour of the tag vocabulary, which constitutes the core component of a social tagging system. Within this context, many studies have been conducted regarding the growth of the tag vocabularies of social tagging systems but there are only sporadic studies for investigating this issue in the field of LORs. This paper aims to contribute in studying how social tagging systems perform in the context of LORs by investigating tag vocabulary growth in OpenScienceResources Repository, a Science Education domain-specific repository with a rich dataset operating in Europe for 5 years.
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