However, by the 1960s, some education critics had begun to voice concerns that public schools were preaching alien values, failing to adequately educate children, or were adopting unhealthy approaches to child development. As a result, a "deschooling movement" took root in the 1960s and 1970s. Critics of public schooling primarily voiced two distinct ideologies, both emphasizing child-centered learning. Liberal critics of public schooling believed that schools did not adequately respect children as individuals, while conservative critics argued that public schools undermined traditional values.