Knowledge intensiveness has featured prominently in most strategies to promote agricultural development. In the past, strengthened research systems may have increased the supply of new knowledge and technologies, but that has not necessarily translated into enhanced agricultural growth. Knowledge converts into products and services through an innovation system - a network of organizations, enterprises and individuals focusing on bringing new knowledge into economic use, together with the institutions and policies that enable a well-functioning network. This book assesses the usefulness of the innovation systems concept in guiding investments to support knowledge intensive, sustainable agricultural development for developing countries and its collaborators.