⊿ Point. {R} Glossary. ◢ Keyword: F. ◥ University. {q} PhD. {tr} Training. ⚫ UK. ↂ EndNote. ☝️ Weerakkody. Frankfurt School. School of social theory and critical philosophy The Frankfurt School (German: Frankfurter Schule) is a school of social theory and critical philosophy associated with the Institute for Social Research, founded at Goethe University Frankfurt in 1923. Active in the Weimar Republic during the European interwar period, the Frankfurt School initially comprised intellectuals, academics, and political dissidents dissatisfied with the contemporary socio-economic systems (capitalist, fascist, communist) of the 1930s. The Frankfurt theorists proposed that social theory was inadequate for explaining the turbulent political factionalism and reactionary politics occurring in 20th-century liberal capitalist societies, such as Nazism. Critical of both capitalism and of Marxism–Leninism as philosophically inflexible systems of social organization, the School's critical theory research indicated alternative paths to realizing the social development of a society and a nation.[1] History Theorists Praxis.