This paper describes benefits of year-round education experienced by principals and teachers in 12 secondary schools in Jefferson County, Colorado. The Concept-6 three-track plan, which was implemented for 15 years, resulted in the following benefits: increased learning time and intensity; fifth-quarter enrichment; remedial intersessions; industrial cooperative education; and alternative education. Year-round schooling contributes to a decreased dropout rate and provides all-year counseling, cooperative work experience, school and community services, and improved staff development. Various curriculum sequences are presented. One figure, eight tables, and four sample calendars are included. (LMI)