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Modification of employees ’ timetables

Workforce scheduling problems have been studied for years. The first approaches (Shift Scheduling Problem, Days-Off Scheduling Problem and Tour Scheduling Problem) had for objective to schedule workers in order to minimize total costs. Recently, another approach that takes the preferences of the employees into account in addition to costs has been developed: the Employee Timetabling Problem. The problem that faces us is the modification of the expected planning of the employees in case of hazard. Our objective is then to change employees’ assignments in order to respond to workload, while minimizing the number of modified employees’ planning. We call this problem Modification of Employees Timetables (MET).