“…Multi echelon has a more complex system that consist of several warehouse and service facilities, multiple suppliers, and several customers. Therefore at an early stage this survey will categorize primary studies based on its networks (single echelon or multi echelon), because this is the first step in identifying real cases that shows in Table V. [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19] Multi Echelon [20], [21], [22], [23], [24] H…”