In 1966, the Singaporean government implemented a policy of bilingual education, where Singaporean students learn both English and their designated native language, which was Mandarin for Chinese Singaporeans (even though Singaporean Hokkien had previously been their "lingua franca"). The "Goh Report", an evaluation of Singapore's education system by Goh Keng Swee, showed that less than 40% of the student population managed to attain minimum levels of competency in two languages. It was later determined that the learning of Mandarin among Singaporean Chinese was hindered by home use of other Chinese varieties, such as Hokkien, Teochew, Cantonese and Hakka. Hence, the government decided to rectify problems facing implementation of the bilingual education policy, by launching a campaign to promote Mandarin as a common language among the Chinese population, and to discourage use of other Chinese varieties.