A robust heuristic method on the clustering-assignment problem model

•Multi-item and pick-by-order.•Clustering-then-assigning.•Between item association.

This research presents an effective way to generate the location rank for shelf space assignment. Instead of the time consuming mathematical programming techniques adopted in the CAPM by Chuang, Lee, and Lai (2012). This research provides satisfactory results with at maximum of 6.1% difference through a far more effective way.