1. Introduction
The last few years have seen rapid growth in business-to-business (B2B) e-commerce models - e-stores, e-procurement portals, and e-marketplaces to buy and sell various products and services from catalogs. Most industry analysts, however, believe that the simple transaction-based business model will have to be augmented with higher value-add services if these e-marketplaces are to remain competitive1. Today, some e-marketplaces are transitioning into e-hubs that intend to support an end-to-end supply-chain spanning multiple enterprises for improving information and decision flow in order to optimize the performance of the extended enterprise. Production-oriented industries such as those involved in discrete and continuous manufacturing should benefit from this shift through better customer response, lower inventory costs, etc.