Andrew Petrie. Sister Teresa introduced the House System, a student representative School Council and the Dalton method of education. Sister Elisabeth (1925–1936) embarked on a building program, including the West Wing with classrooms, dormitories and dining room; the Darnell Art and Music buildings and the swimming pool. Sister Bernadine (1937–1939) led the School through the difficult pre-war years. Sister Mary (1940–1964) led the School through the years of World War II and the resulting changes to School life – closures, reduced enrolments, rationing and shortages. After the War, a new assembly hall (Eton Hall), extra classrooms and dormitories in East Wing; a gymnasium; the School Chapel; Dalhousie classrooms and a boarders’ recreation block and library were erected. The School continued to grow under the leadership of both Sister Jean-Marie (1965–1970) and Sister Helen (1971–1977). The School celebrated its 75th anniversary in 1970 with the opening of Toorak and its library, staff room and science laboratories. In 1977 the Sisters took the decision to appoint a lay Headmistress, while still retaining ownership and guidance of the School. Margaret Kugleman (1978–1982) was followed by Evelyn Heath (1982–1993), Mary Hutchings (1993–1995) and Judith Hill(1995–1996). The Avoca and Jackson Wings were built at this time to provide additional classrooms. A separate Primary School building, Chaseley Wing, opened in 1992, to accommodate growing Primary enrolments. It is named after Sister Chaseley Anne who was in charge of the Boarding House from 1979 to 1990. In 1995, the school's centenary year, the Philip Harris Sports Centre was built. It is supplemented by outdoor facilities at Windsor Park and a rowing centre at Breakfast Creek. An art room and music block were built in the 1930s, and in 2003 a new Arts Centre was built. This has three art studios, pottery area, and a display gallery. The Eunice Science and Resource Centre was opened in 2012, named after Mother Eunice. In 2020, the school built a new sports precinct. This has a water-polo sized heated swimming pool with two 50m lanes, tennis courts with lights, gymnasium with an oak sprung floor, a strength and conditioning gym, an indoor climbing wall featuring seven belay stations and 76m2 of climbing, a dedicated ergometer room to support rowing and modern health and physical education classrooms. The rebuilt gymnasium within the sports precinct took Philip Harris' name again and is called the Philip Harris Gym. Academics Curriculum In the secondary school,