A central management system exchanges data with a store at a remote site, where a display imparts visible and/or audible information to store customers. Monitoring means at the store monitors behavior of store customers. Predetermined content data is transmitted from the central management system to the remote store site for display. Monitored customer behaviour data is transmitted from the remote store site to the central management system, to enable evaluation of the customer behaviour in response to the content data. Data transmission between the central management system and the remote store site is effected without using the in-store IT system. Stock may be monitored at a Point of Purchase (POP) display. Barcode readers may be monitored passively. Brand means may impart visible or audible information to store customers or operatives. Compliance means may monitor whether a poster is displayed at a POP.