This book aims to introduce the science of occupational therapy, which this year marks a century of life and evolution. It is the science that recognizes the significance of "work" in an individual's well-being; it is the profession that differs from the others, that builds bridges, that is filled with emotions, that invests in relationships. It is the occupational therapists who work behind the "scenes" to provide individuals with the tools to be the protagonists in their own daily work.