Robert Heiny Anatomy of Teaching-Learning (ATL) A draft of anatomy of teaching-learning (ATL) is available. ATL is to social process of teaching-learning as human anatomy is to medicine. From a learners' view (ALV), it describes the infrastructure of teaching-learning. The smallest unit of analysis is a dyad, that is, relationships. ANATOMY OF TEACHING-LEARNING (ATL), from a learners’ view (ALV), is the science which studies relationships among the social structure and its parts in the instruction of lessons that result in learning. It identifies and describes the organization (system) of interrelated parts of social processes that result in learners learning lessons.