2.2. Layout Design of Dock. In the literature, most prior studies on warehouse layout design of warehouses are closely related to the dock layout design. In fact, dock layout design problem generally includes several subproblems, such as the optimization of the quantity and location of facilities and the prediction of the frequency and strength of facility employments. Heraguetal. [18] divide warehouse into several functional areas, including reserve storage area, forward (order collation) area, and CD. Using data available to a warehouse manager, they develop a mathematical model and a heuristics algorithm that can be used to find the jointly optimal solution for the allocation of products to these functional areas and the size of each functional area. Lateron, Alpan et al. [19] consider an analytical model in a multiple receiving and shipping doors cross-docking environment. They develop the optimal or near optimal facility scheduling policies that can minimize the total costs with respect to the transshipment operations at the facility for cross-docking. Most recently, Vis and Roodbergen [20] present a dynamic optimal design methodology to select control policies which help to determine the optimal layout rules for cross-docking facilities