Storage assignment policies aim to provide ways for allocating
items in an order picking warehouse so that order picking time will
be reduced. Petersen (1997) divided storage assignment policies
into three broad categories: randomized storage, volume-based
storage and class-based storage. Therandom storage policy is widely
used in many warehouses because it is simple to use, often requires
less space than other storage methods, and results in a better level of
utilization of all picking aisles (Petersen and Gerald, 2004).