Fourth Generation Optimization considers variances in equipment cost and requirements. Truckload and Intermodal carriers provide different types of equipment at different rates to meet a multitude of requirements. A shipper may wish to consider the tradeoff of using a 53ft Dry, a 45ft Ocean Container or a 40 ft. Domestic Container. The choice of the type of equipment will depend not only on the carrier’s rates but the product requirements and the dock facilities at the origin and destination locations. Fourth Generation optimization allows the solver to consider all these requirements and select only those carriers and equipment types that can meet those requirements.