In order to describe and simulate the global behavior of an organization (macro level), taking into account the individual behaviors of the organization actors (micro level), we present an approach that addresses the knowledge acquisition process within a multiactor system (ACKA, Approch for Cooperative Knowledge Acquisition) and a multiagent-based simulation called AviSim (Aviculture & Simulation). In this paper, we show how we use ACKA to build AviSim. AviSim is a tool simulating the impacts of individual behaviors in the decision processes of managing feed raw materials, in the case of french poultry production system.