Relations between the researcher, the extension agent and the farmer in terms of the social systems to which they belong are analyzed as wek as the process of technological transfer both within and between systems. This is a more realistic form of analysis because in practice the behaviour and relations of individuals in the process of technological transfer are determined not only by their individual chaharacteristics, but also by the behaviour and relationships defined by the organizations or groups to which they belong. Thus the behaviour of an extension agent is conditioned by the rules, procedures, job definitions, selected methods, etc. Which the extension service has established. Social systems are constituted by elements which are interrelated by processes. The basic element of a social system is the role (father, mother, son, extension worker, researcher, farmer) or position of the person in the system, and the basic process is the relationship between roles. This relationship or interaction between roles is the fundamental structural unit of the social system. (MIBA)