A sequence of learning activities can be modeled as a graph with specific properties. The vertices or nodes of the graph are the learning activities. Learners perform some of these activities individually, some in teams, and others with the whole class. The graph has a geometric nature, time being represented horizontally and social organization (individual, team, class) vertically.
These activities can be inspired by heterogeneous learning theories; a graph models the integration of heterogeneous activities into a coherent pedagogical scenario. The edges of the graph connect activities. They represent the two-fold relationship between activities—how they relate to each other from a pedagogical and from an operational viewpoint.