**2.3 E-learning interoperability standards**

To fulfill the RO for the OP, corresponding interoperability standards were consulted and examined regarding their suitability for the given use case. "In general, the purpose of e-learning interoperability standards is to provide standardized data structures and communications protocols for e-learning objects and cross-system workflows. When these standards are incorporated into vendor products, users of e-learning can purchase content and system components from multiple vendors, based on their quality and appropriateness, with confidence that they will work together effectively" [33]. According to [33], the interoperability standards can be divided into the following five categories:
