Introduction of the seminar; Acknowledgements; State of art in agroforestry; Highlights in agroforestry research and practice; Significance of social organization and cultural attitudes for agroforestry development; Classification of agroforestry systems; Economics in agroforestry; Silvicultural concepts in agroforestry; Ergonomics and its possible applications in agroforestry; A critical analysis of an agroforestry project in Acosta and Puriscal, Costa Rica; Criteria for the evaluation of organic matter and nutrient cycling in agroforestry systems; Agroforestry system interactions: man-tree-crop-animal; Case studies: soil and plant aspects of agroforestry systems; Response of hybrid Theobroma cacao to two shade associations in Turrialba, Costa Rica; Associations between cacao (Theobroma cacao) and shade trees in southern Bahia, Brazil; Nutrient cycling in agroforestry systems of coffee (Coffea arabica) with shade trees in the central experiment of CATIE; Experiences with coffee shade trees in Costa Rica; Coffee and cacao plantations under shade trees in Venezuela; The pejibaye palm (Bactris gasipaes H.B.K.) as a potential agroforestry species; Agroforestry systems with Gliricidia sepium; Alley cropping of annual food crops with woody legumes in Costa Rica; Results from the CATIE "Central Experiment": pasture and shade tree associations; Experiences with fence line fodder trees in Costa Rica and Nicaragua; Priorities for research on nitrogen fixation in agroforestry systems; Population dynamics of guava (Psidium guajava L.) in pastures; Case studies: diagnosis and technologies for agroforestry; The ICRAF agroforestry farming systems approach international council for research in agroforestry; Farmer'attitudes towards trees; Factors affecting the adoption of agroforestry innovations by traditional farmers; Development and application of agroforestry practices in tropical Asia; Agroforestry in Africa: potentials and constraints to technical and socio-economic development; Agroforestry experiences in southern Sudan with special reference to small farmers; Characteristics of farms producing basic grains in four areas of Central America; Case studies: economics and ergonomics in agroforestry; Economics of agroforestry systems in Africa; Economics of agroforestry systems in Asia; Advances in economic studies of agroforestry plantations in Central America; Ergonomic and biological aspects of human work in agroforestry productions systems; Reports of working groups: evaluation and specific recommendations; Working group A: soil and plant aspects of agroforestry systems; Working groupo B; Diagnosis and technologies for agroforesry; Working group C: Economics and ergonomics in agroforestry; Organization; Seminar committee; Participants; Programme.