We propose a methodolo gical framework for designing security systems.This framework is founded on agent-oriented

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requirement modeling framework.We propose to use so cial modeling concepts to analyze the business and organizational context of systems with regard to security.This methodological framework encompasses analysis on the functional and non functional requirements in relevance to security

making trade off when design

thus integrating security into the system design process from the outset.This paper uses the Online Ordering example for illustration.