http://repub.eur.nl/res/aut/12278/ List of Publications en http://repub.eur.nl/static-eur/img/logo.png http://repub.eur.nl http://repub.eur.nl/res/pub/15307/ 1998-09-20T00:00:00Z Demand for spare parts can sometimes be classified into critical and non-critical demand, depending on the criticality of the equipment in which it is installed. To effectively handle this situation in spare parts inventory control, we propose a stocking policy where some of the stock is reserved for critical demand. For Poisson demand and a lot-for-lot stocking policy with a deterministic replenishment lead time, approximations of the service levels for both classes of demand are derived, and verified by simulation. Finally, a numerical example is presented to illustrate the advantages of using the proposed policy. http://repub.eur.nl/res/pub/1384/ 1996-01-01T00:00:00Z Demand for spare parts can sometimes be classified into critical and non-critical demand, depending on the criticality of the equipment in which it is installed. To effectively handle this situation in spare parts inventory control, we propose a stocking policy where some of the stock is reserved for critical demand. For Poisson demand and a lot-for-lot stocking policy with positive replenishment leadtime, approximations of the service levels for both classes of demand are derived, and verified by simulation. Finally, a numerical example is presented to illustrate the advantages of using the proposed policy.