They offered a two-year course, with appropriate attention to science, manual training, domestic science, and the predominant economic interests of the local area. In retrospect, the intermediate school concept did not work very well, mainly because of the expense and organisational problems involved in providing separate schools for a two-year course. In 1936 there were only two separate intermediate schools in Queensland, though intermediate classes were attached to a number of high schools. The first suburban state high schools in Brisbane to offer a range of subjects were opened at Wynnum in 1942 and Cavendish Road (Cavendish Road State High School) in 1952. Rural state high schools have always offered a range of subjects, mainly because the size of their localities would not permit the provision of separate schools similar to the Commercial, Domestic Science and Industrial High Schools in Brisbane. In August 1957 there were 37 state high schools, and 34 secondary departments attached to primary schools in Queensland, with a total enrolment of 15,444 (including correspondence students). After 1957, the Department further extended secondary education by liberalising the awarding of scholarships, opening many new secondary schools and instituting transport services for isolated students. By 1980 the number of state secondary schools in Queensland had almost tripled to 135 high schools and 68 secondary departments, while enrolments had increased to 105,427. In the same period, Queensland's population increased from 1,392,384 to an estimated 2,213,000. Although this expansion was largely enabled by the more favourable economic conditions in Australia during the 1950s and 1960s, the forces which helped to bring it about and shape its course were diverse and complex. During the period 1930 to 1957 there were many changes in community attitudes and new perceptions of societal needs arising from many demographic, industrial and economic movements. The following factors had a particularly significantly influence on the demand for secondary education in Queensland: By 1960 almost 80 per cent of 14-year-olds were remaining at school of their own volition, so that it could be said that the Watkin Committee's recommendation in 1961 that the leaving age be raised to 15 sought to recognise a "fait accompli". The Watkin Committee (chaired by Herbert Georg Watkin, Director-General of Education) also recommended that this extension in the years of compulsory schooling should be coupled with a reduction in the age of transfer from primary to secondary school and the provision of new secondary curricula. These recommendations were largely implemented under the "Education Act of 1964". Under this Act, secondary school curricula and examinations became the responsibility of two new administrative bodies, the Board of Junior Secondary School Studies and the Board of Senior Secondary School Studies.