This study attempted to determine if the type of class schedule (traditional, A/B block, or accelerated block) used in Texas public high schools significantly affects students' achievement results, attendance rates and dropout rates. One thousand four hundred ninety (1490) Texas high school principals were surveyed to determine the type of schedule currently in use on each campus, the type of schedule previously used on each campus, the length of time the current schedule has been in place on each campus, and the length of time that the previous schedule was used on each campus. This study is particularly significant in that this research provides information to assist principals in determining if block scheduling is instrumental in improving achievement in reading and mathematics, in improving attendance and in lowering dropout rates. The results of the study indicated that the use of a particular type of schedule: traditional, A/B block, or accelerated block is not directly correlated to improved achievement, attendance, or dropout rates. An expectation that the implementation of a traditional, A/B block, or accelerated block schedule will be the sole factor to cause improved student achievement, improved attendance rates or improved dropout rates is inappropriate. Ultimately, campus and districts officials …