Economists investigating consumer demand have accumulated considerable evidence showing that consumers generally have subjective preferences for characteristics of products and that their demand for products is significantly affected by their perceptions of the product's attributes. However, the role of farmers' preferences in adoption decisions have received very limited attention in adoption studies conducted by economists. This paper tests the hypothesis that farmers' perceptions of technology characteristics significantly affect their adoption decisions. The analysis, conducted with Tobit models of modern sorghum and rice varietal technologies in Burkina Faso and Guinea, respectively, strongly supports this hypothesis. Our results provide a strong case for future adoption studies to expand the range of variables used away from the broad socio-economic, demographic and institutional factors to include farmers' subjective perceptions of the characteristics of new agricultural technologies.• Corresponding author. nology adoption by economists (O'Mara, 1980) did not have access to direct observations on farmers' perceptions, it was not possible to directly and quantitatively test the hypothesis that perceptions of technology attributes influence adoption decisions. Instead, variables which affect farmers' access to information, and hence their perception formation (e.g, extension, education, media exposure, etc.), are typically used in economic models of the determinants of adoption decisions (Feder et al., 1985;Shakya and Flinn, 1985;Kebede et al., 1990;Polson and Spencer, 1991;Strauss et al., 1991).Economists investigating consumer demand have, however, accumulated considerable evidence showing that consumers generally have 0169-5150/95/$09.50