This document analyzes learner categories and their evolution over multiple iterations of two MOOCs. The researchers classified learners into four categories - completers, disengaging, auditing, and bystanders - based on their level of engagement as measured by videos watched and quizzes submitted. They found the proportion of active participants tended to decrease over time, while course demographics and learners' intentions remained stable. Most course activity was driven by completers, while most auditing learners only explored a minor fraction of the content. Demographic factors had a more significant impact on completion rates in some contexts. The researchers are now analyzing more MOOCs and conducting interviews to better understand these dynamics and define metrics for MOO