Caron, Marchet, and Perego (1998) evaluated and compared different
routing policies with storage assignment based on COI. The result
demonstrates that in COI-based storage systems the traversal
policy outperforms the basic return policy for the range of pick
densities and the COI-based ABC curves most frequently found in
real-world applications. Caron, Marchet, and Perego (2000) presented
an analytical approach to layout design of the picking area
in picker-to-part systems using COI-based and random storage policies.
The results show that layout preference seems to be strongly
affected by decisions concerning the adoption of a COI-based storage
policy.