This paper presents a new load adjustment approach by overlapping, guarante
eing the existence of a limited capacity schedule without scheduling under
the assumption of preemptive tasks. The new method exploits the order's mar
gins and tries to respect the just-in-time principles. First, we introduce
the overlapping production planning. Second, we present the application of
this approach to the case of manufacturing-to-order companies and to the se
asonal industrial activities. Finally, we show how we can use this approach
in the case of pure and generalized flow-shop. (C) 2000 Elsevier Science B
.V. All rights reserved.