into any kind of higher or further education. Increases were also made in educational allowances, as well as spending on science. In 1972, the government allocated 2.1 million DM in grants to promote marriage and family education. Under the Approbationsordnung (medical education profession act) of 1970, the subject of psychosomatic medicine and psychotherapy at German universities became a compulsory subject for medical students, and that same year education of clinical and biomedical engineers was introduced. The Brandt Administration also introduced enabling legislation for the introduction of comprehensives, but left it to the Lander "to introduce them at their discretion". While the more left-wing Lander "rapidly began to do so", other Lander found "all sorts of pretexts for delaying the scheme". By the mid-1980s, Berlin had 25 comprehensives while Bavaria only had 1, and in most Lander comprehensives were still viewed as "merely experimental". Housing In the field of housing, various measures were carried out to benefit householders, such as in improving the rights of tenants and increasing rental assistance. According to the Rent Subsidies Act (Wohngeldgesetz) of 1970, "low-income tenants and owners of accommodations are supported with rents and burdens subsidies". The determination of the income of families taken into consideration for housing allowances was simplified, and increased levels of protection and support for low-income tenants and householders were introduced which led to a drop in the number of eviction notices. By 1974, three times as much was paid out in rent subsidies as in 1969, and nearly one and a half million households received rental assistance. Increases were made in public housing subsidies, as characterised by a 36% increase in the social housing budget in 1970 and by the introduction of a programme for the construction of 200,000 public housing units (1971). From 1970 to 1971, an 18.1% increase in building permits for social housing units was made. Other reforms aimed at improving tenants' rights included protection against conversion of rental housing into condominiums, the prohibition of the misappropriation of living space, new regulation of the apartment broker system, and a fee scale for engineers and architects. In addition, the income limits for eligibility for social housing were raised and adapted in order of general income trends. A loose form of rent regulation was introduced under the name of "Vergleichmieten" ('comparable rents'), together with the provision of "for family-friendly housing" freight or rent subsidies to owners of apartments or