The interplay of materials with learning and teaching is complex, so SERP employs designers who have previously worked as teachers in order to gain an unusual level of insight into the day-to-day happenings in schools and how prototypes affect a classroom dynamic. But SERP designers do not rely only on their training and experience; they systematically seek out feedback from both researchers and practitioners. Most importantly, they strive to create clear, convenient, and sensible options for teachers so time and resources are preserved for what they most want to do... engage with students!