This study compares block scheduling to traditional scheduling used for college level science courses. The researchers surveyed more than 7000 high school students enrolled in introductory college biology, chemistry, and physics courses. Survey results revealed that teaching methods were similar in both scheduling types. Students in AB scheduling, especially those in peer tutoring classrooms, performed less well then students in other scheduling conditions.
Traditional and Block Scheduling for College Science Preparation: A Comparison of College Science Success of Students Who Report Different High School Scheduling Plans
CCRS Center Publication
High School Journal