Data and Problem Set structure https://sites.google.com/site/selentaied2015/home
Another example of the video buggy messages = https://sites.google.com/site/assistmentsstudies/studiesinprogress/misconception-messages-delivered-through-video-2
Future Study for types of tutoring = https://sites.google.com/site/assistmentsstudies/studiesinprogress/comparing-text-video-nothing