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).
A. Weingessel, E. Dimitriadou, and S. Dolnicar. Working Paper 29. SFB ``Adaptive Information Systems and Modeling in Economics and Management Science'', (1999)