Greenwich High School, one of the largest high schools in Connecticut, is a four-year high school serving approximately 2700 students of diverse ethnic and cultural backgrounds.  The school's philosophy of "freedom with responsibility" encourages students to make decisions affecting both their study and leisure time.  The Cardinal Rules promote a climate of mutual respect and concern for others.   The Headmaster and the Assistant Headmaster have overall responsibility for the operation of the school.  Entering students are randomly assigned to one of five Houses - Bella, Cantor, Clark, Folsom, and Sheldon.  Each house has its own Housemaster, as well as its own guidance counselors and other support services for students, along with a core English/Social Studies program in grades nine and ten.   The Houses adjoin a one-acre enclosed area called the Student Center, which serves as a cafeteria, meeting hall and a place to relax between classes.  Classes meet on a rotating eight-block schedule.  A large Media Center supports all learning programs of the school and helps students become lifelong learners by providing a wide variety of information, resources and technology.    Numerous Computer Labs are available throughout GHS for teachers and students.  Labs are located in the houses, science, foreign language and art and music wings and the Media Center.  Additional computers are available in Learning Centers, the Media Center and other departments throughout the building.   GHS offers over 295 courses and a wide variety of co-curricular activities.  Student activities include student government as well as academic, international, service, sports and special interest clubs.  The school fields 36 varsity teams which have won numerous county, state and regional championships.  Students and teachers consistently win recognition and high honors, not only for academic achievement, but also in the fields of art, drama and music.   The Greenwich community strongly supports its public schools.  The Greenwich High School PTA  serves the school through volunteering, fundraising and publishing Focus, a news sheet for parents published quarterly and mailed home with students' report cards.