Mattering, which is about feeling valued and adding value, is essential for health, happiness, love, work, and social well-being. We all need to feel valued by, and add value to, ourselves, others, co-workers, and community members. This book shows not only the signs, significance, and sources of mattering, but also presents the strategies to achieve mattering in our personal and professional lives. It uses research-based methods of change to help people achieve a higher sense of purpose and a deeper sense of meaning. Each chapter gives therapists, managers, teachers, parents, and healthcare professionals the tools needed to optimize personal and collective well-being and productivity. The volume explains how promoting mattering within communities fosters wellness and fairness in equal measure. By using the new science of feeling valued and adding value, the authors provide a guide to promoting happier lives and healthier societies.