Burgos, D., Moreno-Ger, P., Sierra, J. L., Fernández Manjón, B., & Kooper, R. (2007). Authoring Game-Based Adaptive Units of Learning with IMS Learning Design and <e-Adventure>. International Journal of Learning Technology, 3(3), 252-268.Electronic games and simulations (eGames) are a valuable support for adaptive learning. This adaptation can be based on different inputs, such as the user´s performance, behaviour or cognitive load. Both adaptation and eGames can be modelled with IMS Learning Design or integrated from an external resource. In this article we show the relation between IMS Learning Design and the <e-Adventure> Project when it comes to authoring adaptive Units of Learning integrated with eGames. We first describe the challenges of this objective and the several different solutions on authoring and integration. We also describe the content-centered authoring approach in <e-Adventure>, and the need for a communication service with IMS LD that makes a bi-directional influence on the user’s adaptive learning experience. At the end, we describe a practical example that illustrates how an adaptive IMS LD Unit of Learning with an integrated <e-Adventure> eGame is developed.This paper is partially supported by the European projects TENCompetence (IST-TEL/2004-2.4.10, www.tencompetence.org) and ProLearn (IST 507310, www.prolearn-project.org), and the research group <e-Ucm> (www.e-ucm.es). The Education and Science Spanish Committee (projects MetaLearn TIN2004 08367 C02-02 and OdA Virtual TIN2005-08788-C04-01) and the Regional Government / Complutense University of Madrid (grant 4155/2005 and research group 910494) have also supported this work partially. Special thanks to Bruno Torijano Bueno for his participation in the creation and preliminary tests of the sample game