“…Lewis et al, 2010), or forms of knowledge diffusion to be developed (Belgrave et al, 1990). it must be improved by diffusing knowledge, technologies or "good practices" designed by science studying practitioners' knowledge makes it possible to improve supports and education to improve this knowledge "classifying them into rational and irrational practices based on the evaluation of a group of scientists and agricultural extension officials working in the area" (Bonny and Vijayaragavan, 2001) "determine baseline knowledge and identify knowledge gaps of farmers" (Nampanya, 2010) "local people's knowledge and economic realities are the main factors, as well as natural conditions, that drive this land degradation" (Binh et al, 2008) "farmers need to be educated [...] to ensure sustainable [...] control " (Nyeko et al, 2002) "Experience has shown that to ensure IPM adoption, the complexities of local agro-production systems and contextspecific folk knowledge need to be appreciated " (Wyckhuys and O'Neil, 2007) "Farmers' knowledge [...] as prerequisites to IPM adoption" (Hashemi et al, 2008) "providing training based on farmers' real needs" (Kiptot et al, 2006) 2. To document practitioners' knowledge to capitalize on it or to legitimize it in the development process -practitioners' knowledge is derived from a long coevolution with their environment practitioners' knowledge is part of a cultural and social heritage to be protected; it must be documented it supports sustainable technical systems and plays a central role with respect to sustainability issues it is therefore legitimate and becomes a militant factor for endogenous means of development "their knowledge of rangeland plants and principles of sustainable rangeland management is indigenous and based on centuries of experience and observation" (Ghorbani et al, 2013) "limited intergenerational transfer of IK currently threatens its existence in the longer term" (Speranza et al, 2010) "local and traditional knowledge is valuable, adaptable and necessary in coping with risk and uncertainty in a changing world" (Beckford and Barker, 2007) "integration and inclusion of farmer perspectives in [...] national agricultural development planning and policy formulation processes" …”