The book is an edited volume of articles by eminent scholars in the field of specialist knowledge transmission through genre variation focussing particularly on the issues of standardization and hybridity. It offers some of the important findings of a National Research Project that has involved researchers from several Italian and foreign universities, in particular those from the University of Palermo and the University of Salento. The main focus of the project was to analyse discursive popularization in the contexts and domains of natural sciences, law and commerce, viewed in a diachronic perspective.