This book elaborates on the distinction between societal innovation and social innovation. It provides eight case studies to illustrate the scope, process, outcome, and impact of societal innovation and social innovation. In addition, the book proposes a model for interested parties to maximize their contribution for the common social good in a systematic and effective way. Case studies are used to illustrate concepts for readers to grasp the real essence of the relatively abstract notions of societal innovation and social innovation. In doing so, the book shows how small efforts can bring big benefits for the under privileged and to society as a whole. This book serves as a helpful resource for government officials, social innovation practitioners, social entrepreneurs, Non Profit Organizations, as well as students who would like to contribute to the common social good.