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In addressing integration issues, service-oriented architecture (SOA) has emerged and been adopted by banks, but many of them have failed to achieve significant SOA benefits. An important reason for this failure is attributed to the absence of a methodological framework that explains factors influencing SOA adoption in e-banking. In addition to this, the normative literature reports that differences may exist between organizations from developed and transition economies when they adopt integration technologies. Thus, the aim of this paper is to (a) propose a methodological framework for SOA adoption, (b) test it through case studies conducted in a developed and a transition economy, and (c) investigate differences and similarities among these two types of economies. The findings verify our framework and suggest some additions to it as there are new factors that were observed during the case studies like SOA …