Identified in earlier VitalSource/Bookshelf learning-analytics research and reconfirmed at scale by Van Campenhout, Autry, Clark & Johnson (ACM Learning@Scale 2025), who analyzed 15.2 million data events from 18,546 students across seven courses and described embedded practice as causally about six times more effective for learning than reading alone. The 2025 replication specifically tested whether the effect survives when the practice questions are AI-generated rather than human-authored, and found that it does — a load-bearing result for AI-graded interactive textbooks like Dartmouth's Phosphor platform.