The sections “Targeted Cosmetics” (part VII) and “Cosmetic Vehicles” (part VIII) have been considerably reduced in the third edition and intentionally focused on emerging products that will represent, for most of them, new trends in cosmetology. For more conventional cosmetic products, the reader is referred to some excellent chapters from the two first editions. Finally, the last section, “Ethics and Regulations” (part IX), provides a clear overview of the quickly evolving worldwide regulatory context and ethical requirements that should always lead any development and testing of new products.