Charles Jencks was the first to demonstrate that Modern architecture in the 1960s and 1970s had undergone a profound mutation into three major approaches - Post-Modernism, Late Modernism and New Modernism. He has shown how our pluralist age has oscillated between these and traditional approaches .<br> In this classic title, the thinking and ideas that have informed, and continue to inform the architecture and urban design around us today, was presented as a compilation of writings by the most important architects, urbanists and theorists of the second half of the 20th century. The new edition brings thinking up to date with additional material that suggests the direction theory is taking into the 21st century.