Introduction: Shifting from conventional to agroecological based cropping systems faces differerent issues, mostly methodological and technical (Steiner, 1985, Malézieux et al., 2009). This paper aims to present the Diagnosis, Assessment, Training and Extension (DATE) approach used in different tropical contexts aiming to scale-out innovative and locally adapted farming systems. This approach has been used in in different tropical countries under small farming contetxs e.g. Madagascar, Laos, Cameroon, to design innovative cropping systems based on Conservation Agriculture principles (Séguy et al., 2006). The pillars and the challenges of this DATE approach are to work simultaneously at three scales i.e. field, farm, territory integrating two main concepts of cropping system designing, the de-novo and the step-by-step approaches (Meynard et al., 2012).