1. IMS Learning Design specification (February 2003), http://www.imsglobal.org/learningdesign/
2. Koper, R.: Modelling units of study from a pedagogical perspective: The pedagogical meta-model behind EML, document prepared for the IMS Learning Design Working Group. Open Universiteit Nederland, Heerlen (2001)
3. IMS Tools Interoperability (February 2006), http://www.imsglobal.org/ti/
4. Wilson, S., Liber, O., Johnson, M., Beauvoir, P., Sharples, P., Milligan, C.: Personal Learning Environments: Challenging the dominant design of educational systems. In: Joint International Workshop on Professional Learning, Competence Development and Knowledge Management (LOKMOL and L3NCD) (October 2006)
5. Assessment provision through interoperable segments (May 2007), http://www.jisc.ac.uk/whatwedo/projects/apis.aspx