According to one of Marshall Berman's books (Berman 1983,[page needed]), modernity is periodized into three conventional phases (dubbed "Early," "Classical," and "Late," respectively, by Peter Osborne (1992, 25):
* Early modernity: 1500-1789 (or 1453-1789 in traditional historiography)
* Classical modernity: 1789-1900 (corresponding to the Long nineteenth century (1789–1914) in Hobsbawm's scheme)
* Late modernity: 1900-1989
Some authors, such as Lyotard and Baudrillard, believe that modernity ended in the mid or late twentieth century and thus have defined a period subsequent to modernity, namely Postmodernity (1930s/1950s/1990s–present). Other theorists, however, consider the period from the late 20th century to present to be merely another phase of modernity; this phase is called "Liquid" modernity by Bauman or "High" modernity by Giddens (see: Descriptions of postmodernity).