The finer grouping layer beneath this atlas's six driver type categories, forty nine live entities strong as of this wave: fourteen groupings under Curriculum, Assessment and Policy, ten under Learning Theory and Concepts, seven each under Institutions and Systems and Thinkers, six under Pedagogical Approaches, and five under Qualifications. A subcategory exists so a category holding dozens or hundreds of entities can still be browsed as a set of human sized groups rather than one long flat list, and each carries its own prose explaining what belongs in it and what does not.