Portals went through the following different life cycle stages: desktop organization and personalization; single intranet-based portals such as human resource and Internet product-based or industry-based portals; functional-based portals such as knowledge management and business intelligence; and integrated intranet-based enterprise portal (EP) covering some or all functions of the enterprise (see for example http://www.ebizq.net/topics/eai/features/1650. html on how integrating portals and business process management (BPM) enabled the presentation of an integrated view of diverse back-end databases). Current research and practice efforts are directed toward making portals an open system supporting different platforms and allowing its integration into emerging technologies such as Web services (WS). A WS, on the other hand, is defined as an integrating loosely coupled application that uses three major standards: WSDL (definition of WS), UDDI (registry and discovery of WS), and SOAP (access of a WS). However, strongly coupled applications may also benefit from WS technologies to componentized diverse application platforms (i.e., databases, file-based legacy systems) using WS technologies. The article emphasizes cross-organization integration of business function and processes, rather than simply accessing general purpose WS such as weather forecasts and currency conversion. This article highlights challenges stemming from technologies and management issues and opportunities for enhanced application integration and accessibility. Technology-based integration could follow either standard-based open architecture or product-based approach. Current technologies include the product-based MS .NET and the standard-based J2EE and XML. Major players in EP and WS technologies include IBM, Microsoft, Oracle, and BEA, with dedicated efforts and strong commitments to the integration of EP and WS. Major issues related to the management of both technologies include transaction management, message control and choreography, workflow management, and security. The following sections detail the discussions on these challenges and describe opportunities though a master-slave relationship between the two technologies. chaLLEngES