Service technicians of a customer service are dispatched in two steps.

• During the customer call, the dispatcher has to arrange for a target date with the customer. The precision is usually a day or half a day.
• During every night, a cost-optimal dispatch has to be computed for the following day, so that each customer with target date on that day is visited by an appropriate technician. The result of the optimization substantially depends on the target dates.

• Hermes Technischer Kundendienst GmbH & Co. KG (Frank Hinsch) Hermes Technischer Kundendienst GmbH & Co. KG (Frank Hinsch)
• Intranetz Gesellschaft für Informationslogistik mbH (Norbert Ascheuer, Christian Küttner)
• DFG Research Center Matheon "Mathematics for key technologies" ,
  Project C6 "Stability, Sensitivity, and Robustness in Combinatorial Online Optimization"