Book excerpt: This book on Improving Agricultural Extension: a Reference Manual offers a critical review and inventory-analysis of the "State of the Art" in agricultural extension theory and best practices written by internationally known agricultural extension practitioners, educators and scholars. A total of 38 authors from 15 countries contributed to the 23 chapters of this book and thus they provided broad international perspectives, covering both theory and practice, as well as micro and macro issues related to agricultural extension. It is the third edition of a classic reference manual on agricultural extension published by the Food and Agriculture Organization (FAO) of the United Nations. Aimed at agricultural extension planners, managers, trainers, educators, and field practitioners, this book could be useful in improving the quality of agricultural extension and in generating new ideas and methods for increasing further the cost-effectiveness of agricultural extension programmes. It provides many sound and practical suggestions for developing and improving the conceptual, technical, and operational methods and tools in order to strategically plan, efficently manage, and scientifically evaluate a problem-solving, demand-driven and needs-based agricultural extension programmes.