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For many practical learning scenarios, the integrated use of more than one learning tool is educationally beneficial. In these cases, interoperability between learning tools-getting the pieces to talk to one another in a coherent, well-founded manner-is a crucial requirement that is often hard to achieve. This paper describes a reusable software design that aims at the integration of independent learning tools into one collaborative learning scenario. We motivate the usefulness anddoi:10.1109/tlt.2008.18 fatcat:pdgwgp3fwzhlznaod4qm77y43e