One of the extant questions about augmented reality (AR) is how (in)effective it is for the teaching and learning in various formal, nonformal, and informal contexts. The research literature shows mixed findings, which are often highly context-based (and not generalizable). There are some non-trivial costs to the design/development/deployment of AR for teaching and learning. For the users, there is cognitive load on the working memory [(1) extraneous/poor design, (2) intrinsic/inherent difficulty in topic, and (3) germane/forming schemas]. For teachers, there are additional knowledge, skills, and abilities / attitudes (KSAs) that need to be brought to bear.