Article dans une revue: Wossen et al. (2018) puts the spotlight on an important, and until recently underestimated, phenomenon: farmers in developing countries may often misreport whether the crop varieties they grow are improved or not. Given the key role of improved varieties in the green revolution, and ongoing debates on whether productivity gains can still be achieved and reach areas of the developing world where diffusion of improved varieties has been limited, establishing reliable empirical evidence regarding the levels of adoption of improved varieties is a first-order priority.