Abstract: A system for assisting a customer during shopping includes machine-readable currently-owned item indicia store and a compatibility determination subsystem. The machine-readable currently-owned item indicia store includes a smart-card, magnetic disk or the like, for storing indicia identifying selected characteristics of items which are currently owned by the customer, including such information as, for example, accurate color andr styling parameter and metric information. The compatibility determination subsystem generates a compatibility assessment in response to the currently-owned item indicia stored by the currently-owned item indicia store, indicia identifying selected characteristics for items provisionally selected by the customer, and compatibility parameter information identifying compatibilities among various types of indicia.