Exactly! Thank you for bringing that up. In my view the greatest shortcoming of "online instruction" is that there is no "feedback" to the student unless perhaps it is done by skype. Online lessons can be successful in dispensing information, but is no substitute for the one on one instruction of a private lesson where there is "give and take" between the teacher and student. One of the skills of a good teacher is the ability to "monitor and adjust". This simply means to get feedback from the student's efforts as to what is working in the instruction and what is not and then adjust the instruction accordingly. There are many different types of learners and an effective teacher is able to pick up on those differences and teach to those strengths. In my classroom teaching I tried to have at least three different ways to get a concept across to the students.Different students have different needs. But we are losing track of the key word, online. Not a problem, but I'd like to see more about that aspect.