Using the experience from the United States on positive youth development, researchers in Hong Kong developed the Project P.A.T.H.S., trained the potential program implementers and evaluated the developed programs. Because of the overwhelming success of the project in Hong Kong, the project was piloted in mainland China for several years. This project (supported by the Tin Ka Ping Foundation) was piloted in four cities in East China (Shanghai, Suzhou, Changzhou and Yangzhou) from 2011 to 2014. In this book, we present the training program in mainland China and also a leadership project for university students at The Hong Kong Polytechnic University. The chapters underscore the importance of evaluation, and we hope that the findings will motivate university teachers and others to utilise positive youth development principles within and outside of Hong Kong.