This paper examines the dynamics of college students' self-regulatory processes within self-regulated learning (SRL) and externally-regulated learning (ERL) episodes during hypermedia learning. We re-analyzed and extended the results from an original study recently conducted by Azevedo and colleagues  to address four questions related to adaptivity, based on the temporal and dynamic deployment of self-regulatory processes by learners and human tutors in fostering complex science learning with hypermedia. Our questions include: (1) How does access to a human tutor affect the deployment of various SRL processes during learning?; (2) Which transitions between self-regulatory processes are more likely to occur within SRL and ERL?; (3) Which transitions between SRL classes are more likely or less likely to occur with SRL and ERL learning episodes?; (4) Are there significant correlations between learners' observed likelihood of transitions (between SRL processes) and learning outcomes? Lastly, we discuss implications for the design of MetaTutor, an adaptive hypermedia learning environment.