Douglas Biber’s new book extends and refines the research and methodology reported in his ground-breaking Variation Across Speech and Writing (1988). In it he gives a linguistic analysis of register in four widely differing languages: English, Nukulaelae Tuvaluan, Korean, and Somali. Using the Multi-Dimensional analytical framework employed in his earlier work, Biber carries out a principled comparison of both synchronic and diachronic patterns of variation across the four languages. Striking similarities as well as differences emerge, allowing Biber to predict for the first time cross-linguistic universals of register variation. This major new work will provide the foundation for the further investigation of cross-linguistic universals governing the pattern of discourse variation across registers, and will be of wide interest to any scholar interested in style, register and literacy.