The notion of progression in the adoption of Interorganisational Information Systems (IOS) has increasingly received attention from various researchers in the field of technology adoption, but currently there is still a limited understanding of how to address this important concept. Guided by our proposed IOS adoption maturity model, in this study we investigate the IOS adoption progression experienced by organisations within the Australian grocery industry through a multiple case study involving eight dyads. Our model focuses on the two way influence between dyadic relationship and IOS sophistication in the course of IOS adoption progression. This is the first study that provides empirical support for illustrating the notion of IOS progression. This study has important implications to both research and practice.



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