Some weeks ago I posted a link to an interesting post by David Hu about how the Khan Academy is beginning to use machine learning and AI in its assessment systems. David Hu was an intern with the Khan Academy, and here is a video he made reflecting on the work he did during his internship. Do not be put off by the first few seconds of the video, or the later slightly breathless sections. There is real science, clearly expressed, about the "journey towards better assessment practices".
You can also read Hu's fuller post-mortem on his internship.