In 1948, a general child allowance was made payable to all persons in Sweden with at least one child under the age of 16. In 1947, housing allowances for families with children were introduced. In 1954, housing allowances were introduced for pensioners. In 1960, the income-test for the children's pension was abolished. In 1950, a ten-year experimental period was established to build up a nine-year compulsory comprehensive school to replace the old parallel system. A law of 1955 provided state subsidies for municipally organized vocational schools, while a law of 1958 provided state subsidies for adult education centers. In 1962, a final decision was made on nine-year comprehensive school; implemented over a ten-year period. A law of 1964 revised upper secondary school; introduced special preparatory vocational school (fackskola) to complement the high school (gymnasium). A law of 1964 expanded higher education; new decentralized universities and colleges. A law of 1967 instituted municipal adult education (vuxenutbildning). In 1955, medical insurance that provided earnings-related benefits was introduced, and the following year the Social Democrats sponsored a law on "social help" which further extended social services. A maternity allowance was introduced in 1962 that provided a 6-month period of paid leave to new mothers, and a reform of unemployment benefits in 1968 doubled the maximum duration of such benefits from 30 to 60 weeks.