Increasing enrollments and budget problems have prompted many school districts nationwide to experiment with year-round school schedules. Year-round school schedules allow districts to serve more students without constructing more buildings. As in traditional 9-month schools, students in year-round schools attend classes about 180 days a year. The students are divided into groups and school-year starting dates are staggered so there is always a portion of students on vacation. In the 45-15 plan, four groups of students attend school for 45 days, and then have 15 days off. The Concept 6 plan divides the calendar year into six 2-month blocks. Three tracks of students have classes for 4 consecutive months and then a vacation for 2 months. Another year-round schedule divides the school year into five 45-day terms, or quinmesters. It is clear a year-round-school schedule can save an expanding district money over constructing a new school, but transition costs can be high. Academic achievement apparently is not harmed in year-round schools and curriculum can be more varied. To be successful, year-round schools must have the support of the community, since they can disrupt family life and vacation schedules. (JPT)