Interoperability between disparate systems in open, distributed environments has become the quest of many practitioners in a variety of fields. Web-based educational systems are not an exception, but provide some unique characteristics. In this perspectives paper we argue for the role of multiple ontologies in support of Web-based educational systems and speculate on the efforts involved in achieving interoperable systems. We draw our criticism from our involvement in interoperability tasks between ontologies for Semantic Web systems and elaborate on the role of communities of users in interoperability scenarios.
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