We are on 3 trimesters. We have mostly year-long classes but also several trimester-long classes (electives). It is SO frustrating when the Master Schedule Generator moves that year-long class to different blocks for each trimester! I tried setting different priority levels as recommend by Blackbaud but it doesn't matter. I've had many year-long classes split into different blocks so a single section trimester elective can be scheduled on trimester. Even though the year long classes have a higher priority level and the electives are marked as "electives". PLEASE!! I've asked for this for years!