James F. Evans Collection, The current wind of change sweeping across in South Africa provides a unique opportunity for the new unified agricultural extension system in the country to be set up to address the needs of not only large (i.e., commercialized) farmers but also those of the numerous small (i.e., usually less commercialized) farmers, in a way that is effective, equitable and efficient. This article reviews experiences with agricultural extension during the last few decades both inside and outside Africa. Based on this review lessons are extracted that will be important to take into account in designing the appropriate agricultural extension system for South Africa. It is important for an effective agricultural extension service to have effective, interactive linkages with the other "actors" in the agricultural development process (i.e., not only farmers, but also researchers and planners). Some specific suggestions are given on how the unified agricultural extension system might be organized and implemented in the South African situation. While recognized that it is not necessarily the ideal solution, it is proposed that public agricultural extension funds should be primarily concentrated on the smaller less commercialized farmers, while the larger farmers should be primarily catered for by the private sector. (original)