Proof of the efficacy of dermatological products is a prerequisite for clinical testing and registration. Now, efficacy claims for cosmetics must be equally substantiated. This book provides a concise, practical but comprehensive overview of experimental models used to screen, develop and select dermatological and cosmetic formulations. The authors are recognized specialists in their field and use a standardized approach to the projects facilitating the reading for the stressed scientist, for the R+D managers general view as well as for the beginners in the field.