The document describes various models and systems of agricultural extension, including:
1. The conventional agricultural extension system, which aims to increase national production through farm visits. Problems include diluted efforts and farmers' interests being secondary to national interests.
2. The Training and Visit system, which aims to increase individual farm production through regular farm visits and extension worker training. It attempts to address problems of previous systems through improved organization, roles, and supervision.
3. University-led extension systems, with the objective of conducting educational programs to help solve problems. Extension is organized through land grant universities.
4. Commodity development systems focus on efficient production and marketing of high-value export crops through a parastatal