The document discusses the history and usage of radio in schools from 1930 to 2008. It notes that by the 1930s, radio had become an essential part of life in developed countries and was seen as an educational tool. Usage of radio in schools increased, with 65% of schools using it in 1965 and 97% in 1969. However, radio also had disadvantages as an educational tool such as class time collisions, lack of control over lesson planning and technical issues. Over time, radio developed niche uses in schools including community radio stations emerging in the 1970s and digital radio surpassing analog in 2008.