These are all the layers for each learner which
Questions from these layers will be scheduled by the timely practice app according to the retrieval practice cycle
The app, ideally, waits for between ready and overdue number of days between one practice and the next.
The purpose is to embed the learning more deeply into the learners long term memory rather than allow forgetting to happen.
The diagram below shows the layers a learner is learning within the retrieval practice pool