Year-roun schools educational institutions are based on a schedule that has school throughout most of the calendar year, as opposed to having no school in summer. A motivation is that higher student throughput is accomplished via more effective scheduling of school resources. Year round schedules deliver the same number of total days of classroom education and vacation as traditional calendars, distributed differently throughout the year. Funding considerations favor multi-tracking students, which allows more students to use the same number of classrooms, instead of constructing entirely new schools. In addition to these systems, students enrolled in year-round classes often claim that their calendar schedule is more balanced. Advocates claim that year-round calendars help students achieve higher and allow teachers to provide more effective education. Reports from the California State Department Of Education show that standardized test scores increased an average of 9.5% in Grade 3 with an average increase of 13.3% in reading scores. Conversely, opponents insist that year-round education is detrimental to student learning. Some school board officials and studies indicate negative impacts of schedule changes and year-round education. Lawsuits have even been filed against various school districts, citing year-round schools as being "harmful to students."