integrated production and delay-time based preventive maintenance planning model for a multi-product production system. eksploatacja i niezawodnosc - Maintenance and Reliability 2015; 17 (2): 215-221, http://dx.doi.org/10.17531/ein.2015.2.7. customer orders and tactical planning. In this paper, our focus is on the medium-term tactical production planning, since at this level the production quantities or lot sizing should be determined, and the preventive maintenance (PM) decisions should be scheduled. Throughout this paper, we will use the term 'production planning' instead of 'tactical production planning', for simplicity.Production and maintenance departments are usually located separately in modern companies. The production department has to make production planning based on the maximum production capacity, and to satisfy customers' demands, whereas the maintenance department has to ensure the proper functioning of the production system through maintenance actions. Conflict is inevitably generated since the two departments share the same system. If the production department ignores the occupation of maintenance time, or just considers it subjectively or empirically, the system may experience idle time, production delays and even shortages. On the other hand, if the maintenance department schedules the maintenance without considering the produc-
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