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Modeling learner interaction in educational adaptive hypermedia systems (EAHS) is not normally driven by the pedagogical model used in the system. It is argued in this paper that besides driving the modeling of learner interaction, the pedagogical model is a key aspect in modeling the system as a whole. This paper presents a proposal to define and present learner interaction based on problem-based learning. Though the proposed process has been used only in academic context, the preliminary use has indicated its potential of use in real contexts.