The main contribution of this study is to evaluate the insightful patterns of IT adoption by combining business
network and supply chain theories. It is one of the studies with investigating the firms’ internal and external
motivations on the levels of IT adoption. This research reports the actual situations of IT adoption and supply chain
integration that indicates the characteristics of firms in different IT adoption levels. It can also help to explain why
some firms have not chosen to invest more resources on IT infrastructure for B2B Integration level.