Innovation in agriculture involves multiple actors such as farmers, producers' organizations and cooperatives, private companies in supply and value chains, extension services and national research organizations. Previously, the main focus of innovation was research as a means of generating technologies and knowledge, and extension as a means of disseminating the results of research. Recently, increasing attention has also been given to other sources of innovation, which is increasingly perceived as taking place within a system or network of actors that fosters interaction and learning.