This volume from the successful Macromolecular Symposia series presents the contributions from the IUPAC-sponsored International Symposium on «Radical Polymerization: Kinetics and Mechanism», held in Il Ciocco, Italy, in September, 2006. This was the fourth within the series of so-called SML conferences, which are the major scientific forum for addressing kinetic and mechanistic aspects of free-radical polymerization and controlled radical polymerization. SML IV again marked an important step...