Introduction This manual is addressed to front-line agricultural extension work- ers-agricultural assistants primarily, but also to other divisional or district level staff who are engaged in face-to-face communica- tion with farmers. It is about communication skills-those skills which make all the difference between success or failure in the extension worker's efforts to encourage farmers to increase their production and improve their quality of life. It has been written in support of the Kenya Ministry of Agricul- ture's campaign to reduce serious grain losses by advocating and demonstrating efficient post-harvest pest-control and storage tech- niques. So the examples of technical topics are drawn mainly from these fields. But the information and advice on communication processes contained in this manual will be relevant for the full range of agricultural extension messages-and it should also be applicable in countries other than Kenya. The manual begins with a discussion of some fundamental factors influencing communication. It reviews the functions and responsi- bilities of the front-line workers and identifies the key communica- tion competencies they need for effective job performance. It consid- ers the position of the farmers themselves, explores the conditions under which they will be prepared to consider and accept changes in their habitual ways of doing things. It returns to the extension workers and analyzes the means by which they can influence the motivation and receptiveness of the farmers. The manual then takes up in turn the main kinds of communication activity-visiting a farm, speaking in public, giving a demonstra- tion, leading a group discussion-and identifies the factors which