"based on ... (mumble) ...builds on ... learner's existing knowledge " (https://proto-knowledge.blogspot.com/2011/11/building-young-ladys-illustrated-primer.htm

"based on ... (mumble) ...builds on ... learner's existing knowledge " (https://proto-knowledge.blogspot.com/2011/11/building-young-ladys-illustrated-primer.html https://proto-knowledge.blogspot.com/2011/11/building-young-...) is a key part of any such system. A hard part, since it requires building a map of the student's 'database'. Quizzing without being too intrusive. And secured. (Easier than in a classroom. Typically faced with 2-dozen or more students, the teacher has little idea what curriculum each student has been exposed to. Assessing the group wrongly means having to go back and start all over. And the only possible solution still has to be general, not tailored.) This has been and remains a wonderful dream application. If it's for all, not just for the privileged, bravo.