A request for shopping is placed from inside a procurement system. Intelligent agents are launched to retrieve information from catalog sources web-enabled over the internet or within the intranet. Retrieved catalog information is aggregated and associated with other data items. Business rules are applied to make decisions on what part of aggregated information will be rendered to a User. Sorting/multi-level refining operations are enabled. The User selects one or more catalog results, whereupon an XML shopping cart is created and submitted to the procurement system through published interfaces. The procurement system is enabled to place an order on supplier web-enabled transaction systems.