Sequence-dependent group scheduling problem on unrelated-parallel machines

► A group scheduling problem on unrelated-parallel machines is addressed. ► Bi-criteria objective function is considered to benefit both the producer and customers. ► Sequence-dependent setups and dynamic job releases/machine availabilities are assumed. ► A mixed-integer linear programming model is developed to solve the model optimally. ► Tabu-search based algorithms are developed to efficiently solve the industry-size problems.