The primary responsibility for a boy's studies lies with his House Master, but he is assisted by an additional director of studies, known as a tutor. Classes, colloquially known as "divs" (divisions), are organised on a School basis; the classrooms are separate from the houses. New school buildings have appeared for teaching purposes every decade or so since New Schools, designed by Henry Woodyer and built 1861-3. Despite the introduction of modern technology, the external appearance and locations of many of the classrooms have remained unchanged for a long time.

What other term is given to the director of studies?