For about 10 years, from 2005 – 2015, much of the discussion about tracking eLearning revolved around the Shareable Content Object Reference Model (SCORM) and learning management systems (LMS).
J. Hammond, R. Rawlings, and A. Hall. RE '01: Proceedings of the 5th IEEE International Symposium on Requirements Engineering, page 102--109. Washington, DC, USA, IEEE Computer Society, (2001)