Project management, especially in the field of sustainable development, requires to take into account not only the working environment stricto sensu, but also supra components of environmental, social, economic, legislative, etc. dimensions, that may strongly interact with the concerned activity. Ergonomists and psychologists are then led to be interested in, and to develop modeling frameworks to better understand and to make more intelligible this complex environment. The study presented here, which requires taking into account this environment, aims at setting up a novel practice for improving the food safety of a cereal chain in a global context of sustainable development, protection of the environment (flora and fauna) and the health of farmers and consumers. As part of this study, a quick fungal contamination diagnostic tool and a corresponding decontamination process have been developed for an application in the barley-malt-beer food chain. However, the use of these processes may change the agricultural practices in antifungal treatments with the regular and high dose treatments replaced by fine targeted applications only where and when necessary. In relation with this technological development, the challenge is to identify the components of the environment that may become brakes and levers to the implementation of this new practice. In this scope, this investigation mobilizes the modeling of the environment of Thatcher and Yewo (2016). This paper is consequently aimed at presenting the underlying process to this construction, and this in relation with the characteristics of the study. At last, a discussion is initiated concerning the further use of such modelling practices for purposes other than the decision-making processes on ergonomic intervention purposes.