An evaluation was conducted to provide formative information about the pilot implementation of year-round education in three 3 Monday In Orange County, the 180-day calendar was divided into three Monday through Friday 12-week sessions separated by 3-week breaks. A multitrack design (five tracks of students, with four in school at any one time) was piloted at two schools, and a single track (all students on the same schedule) design was piloted at one school. Program evaluation began in spring 1990 and continued until October 1992. Evaluation procedures included consultation with experts, surveys of parents and students, surveys and interviews with teachers and principals, literature reviews, achievement data collection, site visits and observations, and record reviews. Evaluation indicates that the transition was successful and normal school operations were observed at the year-round schools. Student achievement was not negatively affected; overall scores show positive gains for the first year, although these did not continue in 1991-92. Per pupil costs increased in the first year, and later decreased to a level comparable with costs before program implementation. Thirty-two tables present study findings. Six appendixes contain the 1990-91 calendar, a goal statement, the interview for single-track teachers, the student survey, the parent survey, and the teacher survey. (SLD)