In the present chapter, I summarize the theoretical and empirical model of cultural-psychological leadership, referred to as Small Act Psychology (SAP). This model provides a framework for understanding leadership through the lens of small, context-specific actions and interactions that contribute to the co-construction of leadership. SAP offers a means to analyze leadership as a dynamic process that unfolds in irreversible time, reflecting the evolving nature of leadership within specific cultural and psychological contexts. The SAP model challenges traditional, linear approaches to leadership by proposing that leadership should be examined as a continuously adaptive and fluid phenomenon. Rather than treating leadership as a static role, SAP emphasizes how leadership is shaped by the ongoing interactions between leaders and followers, as well as the unique situational factors at play. This approach allows for a more nuanced understanding of leadership as a process that is constantly in motion, responsive to both interpersonal dynamics and broader contextual factors.