Jürgen Habermas in the context of "Communicative rationality"

Civic nationalism, otherwise known as democratic nationalism, is a form of nationalism that adheres to traditional liberal values of freedom, tolerance, equality, and individual rights, and is not based on ethnocentrism. Civic nationalists often defend the value of national identity by saying that individuals need it as a partial shared aspect of their identity (an upper identity) in order to lead meaningful, autonomous lives and that democratic polities need a national identity to function properly. Liberal nationalism is used in the same sense as 'civic nationalism', but liberal ethnonationalism also exists, and "state nationalism" is a branch of civic nationalism, but it can also be illiberal.

Civic nationhood is a political identity built around shared citizenship within the state. Thus, a "civic nation" defines itself not by culture but by political institutions and liberal principles, which its citizens pledge to uphold. Membership in the civic nation is open to every person by citizenship, regardless of culture or ethnicity. Those who share these values are considered members of the nation and, in theory, a civic nation or state does not aim to promote one culture over another. German philosopher Jürgen Habermas has argued that immigrants to a liberal-democratic state need not assimilate into the host culture but only accept the principles of the country's constitution (constitutional patriotism).

The Frankfurt School is a school of thought in sociology and critical theory. It is associated with the Institute for Social Research founded in 1923 at the University of Frankfurt am Main (today known as Goethe University Frankfurt). Formed during the Weimar Republic during the European interwar period, the first generation of the Frankfurt School was composed of intellectuals, academics, and political dissidents dissatisfied with the socio-economic systems of the 1930s: namely, capitalism, fascism, and communism. Significant figures associated with the school include Max Horkheimer, Theodor Adorno, Walter Benjamin, Erich Fromm, Wilhelm Reich, Herbert Marcuse, and Jürgen Habermas.

The Frankfurt theorists proposed that existing social theory was unable to explain the turbulent political factionalism and reactionary politics, such as Nazism, of 20th-century liberal capitalist societies. Also critical of Marxism–Leninism as a philosophically inflexible system of social organization, the School's critical-theory research sought alternative paths to social development.

Constitutional patriotism (German: Verfassungspatriotismus) is the idea that people should form a political attachment to the norms and values of a pluralistic liberal democratic constitution rather than to a national culture or cosmopolitan society. It is associated with post-nationalist identity because, while it is seen as a similar concept to nationalism, the attachment is based on the constitution rather than on a national culture. In essence, it is an attempt to re-conceptualize group identity with a focus on the interpretation of citizenship as a loyalty that goes beyond individuals' ethnocultural identification. Theorists believe this to be more defensible than other forms of shared commitment in a diverse modern state with multiple languages and group identities. It is particularly relevant in post-national democratic states in which multiple cultural and ethnic groups coexist. It was influential in the development of the European Union and a key to Europeanism as a basis for multiple countries belonging to a supranational union.

The public sphere (German: Öffentlichkeit) is an area in social life where individuals can come together to freely discuss and identify societal problems, and through that discussion, influence political action. A "Public" is "of or concerning the people as a whole." Such a discussion is called public debate and is defined as the expression of views on matters that are of concern to the public—often, but not always, with opposing or diverging views being expressed by participants in the discussion. Public debate takes place mostly through the mass media, but also at meetings or through social media, academic publications, and government policy documents.

The term was originally coined by German philosopher Jürgen Habermas who defined the public sphere as "made up of private people gathered together as a public and articulating the needs of society with the state". Communication scholar Gerard A. Hauser defines it as "a discursive space in which individuals and groups associate to discuss matters of mutual interest and, where possible, to reach a common judgment about them". The public sphere can be seen as "a theater in modern societies in which political participation is enacted through the medium of talk" and "a realm of social life in which public opinion can be formed".

World disclosure (German: Erschlossenheit, literally "development, comprehension") is how things become intelligible and meaningfully relevant to human beings, by virtue of being part of an ontological world – i.e., a pre-interpreted and holistically structured background of meaning. This understanding is said to be first disclosed to human beings through their practical day-to-day encounters with others, with things in the world, and through language.

The phenomenon was described by the German philosopher Martin Heidegger in the book Being and Time. It has been discussed (not always using the same name) by philosophers such as John Dewey, Jürgen Habermas, Nikolas Kompridis and Charles Taylor.

Joseph Heath FRSC (born 1967) is a Canadian philosopher. He is professor of philosophy at the University of Toronto, where he was formerly the director of the Centre for Ethics. He also teaches at the School of Public Policy and Governance. Heath's webpage at the University of Toronto declares his work "is all related, in one way or another, to critical social theory in the tradition of the Frankfurt School." He has published both academic and popular writings, including the bestselling The Rebel Sell, which he coauthored with Andrew Potter. His philosophical work includes papers and books in political philosophy, business ethics, rational choice theory, action theory, and critical theory. His stepmother is June Clark.

He received his Bachelor of Arts from McGill University in 1990, where his teachers included Charles Taylor, and his Master of Arts and Doctor of Philosophy (1995) degrees are from Northwestern University, where he studied under Thomas A. McCarthy and Jürgen Habermas.

The Gottfried Wilhelm Leibniz Prize (German: Förderpreis für deutsche Wissenschaftler im Gottfried Wilhelm Leibniz-Programm der Deutschen Forschungsgemeinschaft), or Leibniz Prize, is awarded by the German Research Foundation to "exceptional scientists and academics for their outstanding achievements in the field of research". Since 1986, up to ten prizes have been awarded annually to individuals or research groups working at a research institution in Germany or at a German research institution abroad. It is considered the most important research award in Germany.

The prize is named after the German polymath and philosopher Gottfried Wilhelm Leibniz (1646–1716). It is one of the highest endowed research prizes in Germany with a maximum of €2.5 million per award. Past prize winners includeStefan Hell (2008), Gerd Faltings (1996), Peter Gruss (1994), Svante Pääbo (1992), Theodor W. Hänsch (1989), Erwin Neher (1987), Bert Sakmann (1987), Jürgen Habermas (1986), Hartmut Michel (1986), and Christiane Nüsslein-Volhard (1986).