This study finds that ERP upgrade decision is highly related to the type of incentives expected to be derived (or the type of business problems expected to be resolved by) from an ERP upgrade project. The incentives expected to be realized from an ERP upgrade appears to be a strong factor influencing ERP upgrade decision. Likewise, our empirical results here also suggest that the similarity between a firm and an ERP system business process has a strong impact on an ERP upgrade decision. However, symbols attached to an ERP system do not seem to be a strong differentiating- or salient-factor for an ERP upgrade decision. This is also the case for top management supports, which fail to prove to be a strong factor influencing ERP upgrade decision. However, we can argue that top management supports are necessary but not a sufficient factor to justify for an ERP upgrade.