Is Learning Observable?

I believe learning is not always observable but mostly observable. Learning can be non-observable because it is often used for future use. A concept or tract of information learned today may not be relevant at the moment, but can be applied when it is necessary. It also can be applied when it is understood at a deeper level. I believe it is more difficult to assess non-observable learning. On the other hand, I feel learning is observable through various means. One way is by observing a student's body manners. What are the characteristics being shown? Is the learner mopey, day-dreaming and disinterested? Or is he/she engaged, alert and showing interest in the task at hand? The strategies used by the teacher are helpful to observe learning. Pair and group work entail students co-operating to work on assignments and can be monitored efficiently for student comprehension. Boardwork and individual written assignments can be employed to observe learning. Lastly, one on one consultations allow teachers to asess understanding of material being taught.