If you don't, then we suggest that you contact your school board members and find out. We do not believe these concerns can be summarily dismissed as minor problems. If they can not be answered to your satisfaction, then please tell your board members that you do not want to go to 90 minute classes. Dr. Hornyack indicated that Block Scheduling is too new to have scientific studies to support its claims. This system doesn't work for Advanced Placement courses.
Districts compensate by adding another marking period or additional time during the semester.
If a student miss just 3 days, the student misses 4.5 hours of class time. Students have even less time to catch up since new material is being presented at twice the normal pace. None of these schools use 90 minute classes. I know that Hatboro-Horsham's Superintendent swears by this new system. According to a research report on the top colleges in the United States, the average class period is 53 minutes.