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yes, while there is not general agreed upon definition of who is a great teacher but I believe the two elements of meeting objectives and learning will make a teacher 'great'. I would say that if the majority of the class has achieved the objectives and enjoyed the class because of all the relevant strategies that the teacher used, that would be a difference maker. there may be always some students who miss the point or lag behind, not because of the teaching strategies used but because of other elements i.e., can have ADHD but as long as the teacher tries to reach that student in a personalized manner within the given opportunity, then that teacher I think is 'great'.