HITOP-A: Coordination, Infrastructure and Enterprise Integration Les Gasser Computational Organization Design Lab Institute for Safety and Systems Management USC, Los Angeles, CA 90089-0021 gasser@usc.edu Enterprise integration technologies will of necessity change organizational arrangements within and across firms. The kinds of organizational changes entailed go far beyond hardware, network, and interoperability concerns, and involve new job designs, new coordination structures, new performance management systems, new skill and knowledge requirements, and others. Integrating knowledge from these multiple disciplines in the design and implementation of enterprise integration systems (EIS) can be difficult to achieve for a variety of reasons. Moreover, organizational arrangements and integration technologies interact; the need for new organizational arrangements such as new coordination structures can change the requirements for and loads on enterprise integration technologies themselves. The difficulties emerge from several sources described in this extended abstract.