||With the coming of digital times, global competition resulted in every industry expanding their requirements in supply chain integration and enterprise resource planning. The importance of information system integration industries also increases with time. When all kind of industries continues to integrate supply chain and establish cooperative partnerships, trying to exploit cooperation to acquire more competencies in the market, we want to know whether the information system integration industries establish their cooperative relationship.|
Therefore, our study tried to review the actives and relationship between integrators by the systems integration service process. Through the theory’s guiding, we attend to induce the factors of inter-firm cooperation in system integration industries. We use multiple case study to design our research，and select three cases to study. Semi-structural interview is used to collect needed data to understand the true cooperative relationship between integrators. According to transaction cost theory, resource-base theory and social exchange theory, we propose some theoretical propositions to guiding the real cases analysis.
The conclusions not only describe the real cooperation in Taiwan system integration industries, but also induce several factors of cooperative relationship between integrators, including product characteristics, transaction cost, resource, trust and guanxi. Moreover, the transaction cost is the most important element in the cooperative relationship between information system integrators.