Block Scheduling - Four classes , approximately ninety minutes in length , every day for the first semester . Four completely different classes , again ninety minutes in length , every day for the second semester . Each class equals one credit (The Change Process and Alternative Scheduling , 1996 . A /B Block Scheduling - Four classes , approximately ninety minutes in length , meeting every other day "A " days ) for an entire school year . Four completely different classes , again ninety minutes in length , meeting on alternate days "B " days ) for...











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