Abstract
<jats:p>In the modern organizational landscape, software is no longer a support function; it is the strategic engine of success. As businesses demand greater flexibility and faster delivery, the industry has placed the client at the heart of the development process. Yet, while collaboration has intensified, our understanding of the underlying human dynamics remains a "black box.“ This thesis explores the relational motive to co-Create value and the accumulation of relational capital as the missing links in project performance. By synthesizing marketing theory, project management, and system dynamics, this thesis reveals how relationships can be modeled, measured, and managed. This work provides a rigorous framework for transforming relational complexity into a strategic lever, mitigating overruns, boosting motivation, and securing project success in an increasingly volatile environment</jats:p>