In this video we present a novel application of Case-based Reasoning (CBR) that combines Intelligent Tutoring Systems (ITS) using Augmented Reality (AR) and prediction. The MonitAR system is an intelligent guidance system for users conducting procedures during periods when a human expert has limited or no availability to assist the user. Our approach takes advantage of the relational nature of time-series data to detect a task that the user is completing and diagnose the issue when the user is about to make a mistake. MonitAR uses AR cues to guide the user away from these potential mistakes. Using proven pedagogical models, MonitAR is able to e ectively assist, train, or retrain users in domains ranging from astronauts to mechanics.