In Youtube, I typed “inflation+Khan” in the search box and selected a video clip called “Introduction to inflation | Inflation – measuring the cost of living | Macroeconomics | Khan Academy”. Although this video clip delivers successfully the core concepts of “inflation”, the extent to which this video clip encourages interaction and requires responses from student is fairly light. In my own understanding, the strengths and shortcomings of an educational video clip are both obvious. For strength side, such a video clip permits learners to study knowledge any time they find convenient. The work is largely manageable and worthwhile, as the studying procedure can even be divided into several occasions or sittings. In addition, these video clips do induce learners to make notes and deepened the understanding of the materials

For the shortcoming side, such a video clip does not have a compulsory right to force learners to learn and respond actively. Unlike college instructors, the authors who upload these video clips do not even know whether and to what extent the learners learn the materials. Youtube does have chat-box as the feature that allows interaction between author and viewers. Nevertheless, very few people are willing to share their studying experience and difficulties they encounter while studying. Most feedback in the replies section are more about the real-life reflection of viewers.  Even though these feedback are not useless, they are not directly linked with the studying effects of these video clips. 

By contrast, instructors in colleges are authorized to monitor the studying effects, with iClicker being a famous example. Even in University of Victoria, the instructors in some introductory courses like to give iClicker questions two or three times in one online lecture. As a common scenario, after giving a portion of online lecture, a college instructor gives an iClicker question and receives feedback on what percentage of students answered correctly. Under this way, if some students do not interact actively with instructor or materials, they may fail to answer the iClicker questions correctly and lose points.