Software Process Improvement (SPI) projects are large-scale, complex organization-wide change initiatives. They require considerable investments in personnel, time and money and impact just about every aspect of software firms. The group charged with conducting an SPI project has, however, little formal authority to influence or force software professionals to engage in SPI work or to define and implement changes. The SPI literature suggests that successful SPI initiatives depend on strong commitment from top management. But what should the SPI group do if management support is weak? In this paper, we present an analysis of how an SPI group can use alliances to obtain influence and succeed when management support is weak. Our study is based on a 3-year longitudinal field study of SPI change initiatives at Denmark Electronics. Our findings show that a lack of top management support is not necessarily incompatible with success. This research opens an important new area of research on intra-organizational alliances and information system (IS) implementation. It has the potential to offer new theories and practical advice on how IS implementation projects can be more effectively managed.