Based on linear and linear integer programming techniques, Advanced Planning Systems (APS) enable the rescheduling of a tactical plan each time an event makes it necessary. This raises the problem that planning has certainly become more reactive but also instable, and hence might lead to a loss of robustness when taking decisions. This article presents a specific approach to tactical planning using APS systems. The main aims here are the robustness of the tactical plan and the stability of the decision parameters. The original feature in this article is the use of a “reference plan”. The difference between the plan calculated in period n and the “reference plan” is analysed, and if the deviation is not significant, the plan calculated in previous period is maintained
