This paper contributes to the literature of the adoption of ERP systems and other existing and new IT-based innovation in developing countries. There is an imperative for a framework to explain the decision-making processes in ERP system adoption and vendor selection in general but particularly in developing Asian countries where knowledge on ERP systems is limited. The authors conducted interviews with IT managers and end-users to identify factors affecting ERP system adoption and ERP system vendor selection by Thai-owned and
multinational companies (MNCs) in Thailand. The findings from the study have led to the development of a research model of ERP system adoption. The paper presents a description and discussion of the model and identifies areas for its implementation and future research.