This last chapter summarizes the conclusions of this book regarding policies for achieving more sustainable work lives, and practices to support these policy recommendations and also regarding further research for strengthening these efforts. It will then summarize the main conclusions in these three closely interrelated areas. The chapters of the book have demonstrated how research-based ideas and methods could be incorporated into policies and practices for promoting more sustainable working lives. This applies to all critical phases of the life courses of individual workers. People face many critical career transitions during their work lives and these are important episodes for enhancing both individual and environmental resources and career decisions. Systematic ways to enhance employability of workers also call for societal responsibility on the part of employers. If more sustainable work lives also mean longer working careers, this could present a great opportunity for work organizations and society as a whole as regards more productive work lives.