| Summary: | Includes bibliographical references (p. 502-531). === This research explores an "inside the black box" view on how IT enables sustainable competitive advantage. Most researchers have investigated IT competitive competencies that make up a firm's strategic framework to understand competitive advantage. However, Resource-Based Theory (RBT) probes into the inner workings of a firm, suggesting that a firm's IT assets and resources are the basis of a firm's "rare" core competencies to compete successfully. Using RBT and research in the economics, strategy, and IT literatures, an initial "Framework of Sustainability" was created, against which the case studies were conducted. This framework was used as foundation to develop semi-structured questionnaires in which 45, 90 minute (on average) interviews were conducted with managers in the four firms. Both internal and external documents about the firms and the industry were used as sources of corroborating evidence. In addition, a "bottoms up" view was obtained with evidence gathered from a short questionnaire and focus groups discussions held with 178 staff employees in the four firms.
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