That is a poor way to quantify the quality of an educational product. While quality can and sometimes does drive demand for a product it's frequently possible for demand to be driven instead by fads, trends, and hype.
If you want to measure the quality of something there are far more reliable metrics to use than demand.
With that said I like Kahn Academy. This is a single issue in a large body of educational materials. This one problem doesn't mean the qualify of the full product is bad just that is has room for improvement.
If you want to measure the quality of something there are far more reliable metrics to use than demand.
With that said I like Kahn Academy. This is a single issue in a large body of educational materials. This one problem doesn't mean the qualify of the full product is bad just that is has room for improvement.