Vol 1. Basic Issues and Concepts (2009)
Vol 2. Examples and Background Material (2009)
Vol 3. Training Concepts and Tools (2011)

Volker Hoffman, A Christinck, M. Lemma, M Gerster-Bentayana,University of Hohenheim and Margraf Publishers
This publication would be of special interest to all those involved in the teaching, training, research and management of extension and advisory services.