In many fields, the concept of professional development for workers at varying levels is well entrenched. At the heart of professional development is the desire to expand the "toolbox" of workers' skills. However, for out-of-school time (OST) staff and youth workers, experiences with professional development can vary widely, from high…

Intelligent tutors have become increasingly accurate at detecting whether a student knows a skill, or knowledge component (KC), at a given time. However, current student models do not tell us exactly at which point a KC is learned. In this paper, we present a machine-learned model that assesses the probability that a student learned a KC at a…