About the Author
Helmut Degen, Ph.D., works as a program manager for Siemens Corporate Research (SCR). He was previously a user experience design lead and senior user experience manager for Vodafone Global Marketing in Dusseldorf, Germany, and for the Siemens User Interface Design center in Munich, Germany.
Xiaowei Yuan, Ph.D., is an expert commissioner of the Standardization Administration of the People's Republic of China, and the founder of ISAR User Interface Design. He was previously head of the Siemens User Interface Design Center, Beijing, China.