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As part of a larger research project whose objective was to determine the antecedent condition for eProcurement assimilation, this paper assesses the diffusion of e-Procurement in the Australian public sector. With the help of an extensive literature review and pilot study, eProcurement diffusion attributes were identified, a research model was developed and hypotheses were formulated. Based on the Diffusion of Innovation theory, it is hypothesized that perceived benefits and compatibility impact positively whereas the perceived complexities negatively impact the transactional and strategic assimilation of e-Procurement. A nationwide web-based survey of Procurement/e-Procurement professionals in the Australian public sector is in the final stage of completion at the time of writing of this paper and analysis of the complete set of data will be presented in the camera-ready version of the paper.