The FAA Aviation Instructor's Handbook (FAA-H-8083-9) defines learning as a change in behavior as a result of experience. As an instructor you cannot pour knowledge into a student; you can only arrange experiences from which the student changes their own behavior. This distinction drives everything else in the FOI.
Learning has four defining characteristics you must be able to recite and apply:
Learning occurs in three domains, and you teach in all three on every flight:
Each domain has an ascending hierarchy. In the cognitive domain, the Bloom-derived levels run from knowledge through comprehension, application, analysis, synthesis, and evaluation. In the psychomotor domain, the levels progress from observation/imitation to control, automaticity, and expert refinement.
A primary student who can recite the stall recovery (cognitive) but freezes at the break (psychomotor) has learned in only one domain. Recognizing which domain is failing lets you choose the right fix — more chair-flying versus more repetition versus a confidence-building demonstration. Diagnosing the domain is one of the core skills the examiner will probe on your CFI practical test.