This choice has been implied by the aim to build a realistic model of a particular opinion dynamics. The AEMs have been implemented all over the European Union. Typical examples are reduction of pesticides in order to preserve water quality, different practises favouring biodiversity, landscape improvement, organic farming conversion. It seems that a social aspect, which can be defined as a norm or an image of farming has an influence in the decision. We propose a model which simulates the interactions between farmers, and the reception by farmers of messages from institutions in this context of AEM adoption.
Some messages can modify the anticipations on which the decision is based.
On some aspects however, the farmer can have a rational individual reasoning. Considering the structure topologies, building social networks is necessary because relevant data cannot be easily collected for feeding the model. Then, different social network building algorithms are tested. This enables us to generate a particular class of graphs known as small-world networks. These graphs having the properties of being more clustered than random graphs while their characteristic path lengths are quite as short as these ones.