Determination of a robust economic period in the context of the Wilson Model

This paper presents results about the optimal order interval in a context o f fuzzy information about inventory management. The classical inventory mod el is based on well known cost and demand rate. In practice, this accurate estimation is very difficult to obtain, even impossible. Consequently, we p ropose a solation, not optimal in a classical sense, bur allowing to choose an action which is not far from the optimal policy whatever the economic p arameters may be. These parameters belong to a field which represents the e rror of estimation, this field is important to choose the solution.