This chapter seeks to explore what characteristic of human capital at the individual level links to the performance in project-based organizations (PBOs). In particular, we are interested in the enriching of the individual flexibility construct, which has received minimal investigation from the strategic literature. Moreover, the challenges inherent to this topic are arguably more acute in PBOs, where temporary teams are strategically relevant to the success of the performance and individuals need to be more flexible in order to contribute to high levels of project performance. In particular, we support the idea that the flexibility of members enrolled within teams may influence positively the project performance.