Planning and scheduling problems of production systems: review, classification and opportunities

Production planning and scheduling are generally treated sequentially. Scheduling largely depends on the production quantities computed at the production planning level. Ignoring scheduling constraints in planning leads to inconsistent decisions, therefore, this generates unfeasible solutions. Moreover, solving these problems in complex manufacturing systems is a big challenge in production management. So, integrating production planning and scheduling is crucial to realise the coherence between objectives and workshop's capacities. That is why industries are seeking to improve their production systems to make them more flexible, competitive and reactive, through a better production management and integrating approaches. This paper represents a literature review of the production planning, scheduling and the different approaches that have been elaborated in order to solve the main problematic.