Enterprise Resource Planning (ERP) systems are at the core of every firm. Making people use this costly and time-consuming investment is one of the most important issues to deal with. The main objective of the present study is to find the key determinants that open the door to user satisfaction and adoption. A theoretical model was set and an online survey was conducted to understand ERP users' perspective on such matters. The outcome was the model validation and the understanding that top management support, training, and the system quality are important constructs to assess adoption and user satisfaction. In fact, the latter (system quality) has a significant influence on the behavioural intention to use and also in the overall user satisfaction. As management support is a very relevant determinant to ERP usage. Accordingly, this study enlightens theory, by contributing to a new model of ERP adoption and satisfaction. It also provides relevant evidence to companies involved in the ERP implementation process.

This paper addresses the problem of defining and evaluating the success of ERP throughout the life cycle of the information system. In order to solve this problem, many of the theoretical and empirical contributions on the success of the information system are analysed and discussed. This approach allows the development of a new model; especially in Delone & Mclean supported research.This work will try to establish a different perspective on the success of the ERP and can be an encouragement to some organizations or the many researchers that will be engaging in these areas, in order to help achieve more clearly the expected performance in the acquisition phase of ERPs. Many times that performance does not always happen [1].

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Resumo -Os ERP (Enterprise Resource Planning) são importantes ferramentas de software que integram todas as áreas funcionais de uma organização. Assumem perante a organização um papel preponderante quer no apoio aos níveis de gestão estratégico, tático e operacional. Dada a sua complexidade, o sucesso deste sistema depende de vários fatores. A investigação aqui reportada foca-se no impacto do suporte da gestão de topo e da formação dos utilizadores sobre a adoção e sucesso dos sistemas de informação. Para tal foi desenvolvido um modelo e em seguida realizado estudo empírico para respetiva validação. Os resultados deste estudo mostram como o suporte da gestão de topo e da formação dos utilizadores podem ser determinantes na avaliação de sucesso dos ERP.

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