This thesis is a research work which aims at defining, structuring and explaining success within the ERP specific context through a new approach, given the shortage in literature of frameworks, either innovative or not, about this topic and the absence of an univocal definition of IS/ERP success. By means of a deep literature analysis on four IS/ERP research streams - success, failure, technology acceptance and adoption, theories of fit - and of the definition, supported by field results, of the peculiarities which make an ERP project different from an IS generic one, a sound foundation for the building phase has been created. Negating and contextualizing in the ERP environment the main kinds of IS failure, which are univocally defined and accepted in literature, the modeling phase has yielded an ERP failure negation model. Six new constructs and ten new relationships have been hypothesized and the result fully meets the requirements list defined in the planning phase. Although further works are necessary in order to verify their validity, the proposed model is fitted out with several examples of measure items for each construct, predisposing it for potential practical applications
