From Wikipedia: Block scheduling is a type of academic scheduling in which each student has fewer classes per day (e.g. 4) but each class is scheduled for a longer period of time (e.g. 90 minutes). In one form of block scheduling, a single class will meet every day for a number of weeks, after which another class will take its place. In another form, daily classes rotate through a changing daily cycle. ~ Blocks offer more concentrated experiences of subjects, with fewer classes daily. There may be a less regular rhythm of homework for any given class. ~ Conversion to block scheduling became a relatively widespread trend in American middle schools and high schools in the 1990s. Prior to that, many schools scheduled classes such that a student saw every one of their teachers each day. Classes were approximately 40-60 minutes long, but under block scheduling, they became approximately 90 minutes long. ~ One way of doing block scheduling, called A/B block scheduling, is shown in the example table. Instead of taking six classes every day, students attend three classes every other day and spend twice as long in each class. You can take 4 classes and then another semester you take 4 more classes. The example given here reverts to a six-period day on Fridays. Another way of distributing the classes would be to have "A" and "B" days on alternate Fridays, or to alternate "ABABA" weeks with "BABAB" weeks. ~ Another common block system exists in which students spend up to 100 minutes per class, and earn four credits each semester. Excluding very rare occasions, students at schools using this system take two core classes and two electives per semester. Some schools modify this system further to use one of the mid-day periods for students to take optional year-long classes (usually band) that take half of the period length and take another year-long class during the rest of the period (such as math or journalism)...
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