I’ve published on my SFU blog a glossary of terms that I consider to be essential for understanding the development of competence in adults but that are not in the mainstream of cognitive science. Some of them are unknown because I’ve just recently introduced them, in Cognitive Productivity. Some of them have simply been relatively overlooked. Others existed but I’ve redefined them. These conceptual gaps, which I’ve tried to fill, are obstacles to knowledge-based learning and to understanding such learning.