Year-round school in the United States is neither a new concept nor an unusual one.
Traditional school calendars and year-round schedules both provide students with about 180 days in the classroom.
Others said it could help schools reduce overcrowding by staggering start times throughout the year.
The most common application of year-round education uses the 45-15 plan.
Educators began experimenting with a more balanced school calendar in the early 1900s, but the idea of a year-round model didn't really catch on until the 1970s.
Some advocates said it would help students retain knowledge.
Some parents also complain that such schedules make it more difficult to plan family vacations or child care.
Some of the most common arguments against year-round schools include: School administrators considering year-round education should identify their goals and investigate whether a new calendar can help achieve them.
Students attend school for 45 days, or about nine weeks, then take off for three weeks, or 15 school days.
The normal breaks for holidays and spring remain in place with this calendar.