It is difficult to assess the effectiveness of any teaching, as different schools and professors can always be judged for different approaches to different types of students in any given course. But there is a value in understanding the ways in which students are engaged by specific learning modules, and studying the levels of interest and motivation spurred by a variety of teaching styles and content presentation methods.
This kind of assessment is particularly useful in online learning, as some professors have publicly shared the value of professors exposing their personalities as an asset to increasing student engagement.
