This book defines innovation as “significant, positive change” that innovators work for and hope to achieve. Examples include increases in crop yields due to better management and improved seeds. Productivity growth underpins food and nutrition security, poverty reduction, and the conservation of natural resources. It arises when farmers adopt improved technologies and practices developed by R&D efforts, often paid for by governments or private investors. Adoption is the “prize.” There is no market for innovations without user adoption nor any scope for impact or investor reward. Understanding adoption is therefore key.