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Information System's (IS) requirements inadequacy and volatility are major IS project risks leading to failed, over budget, or over schedule projects. Within requirements determination, an area of focus for the inadequacy and volatility issue is the application domain (i.e., business domain). One step towards better requirements determination methods, techniques, and tools for the application domain would be a theoreticallygrounded model for specification emergence and evolution. This paper presents a model of specification emergence and evolution that is confirmed using a case study.