ABSTRACTThis article introduces a model of dynamic electronic performance support systems. Dynamic support systems are characterized by the ability to change with experience, the ability to be updated and adjusted by the performer, and by the ability to augment other supports found in the performers' community. Dynamic systems are contrasted with the static nature of conventional models of performance support systems. This article reviews the attributes of current performance support systems, describes lessons learned from a project that explored a dynamic model of learning and support, and presents design principles for dynamic performance support.