The maturity level and pace of change of an organization have a significant impact on the role of the Chief of Staff. In rapidly growing or changing organizations, the CoS must be flexible, able to handle uncertainty, and quickly prioritize changes. In crises or leadership transitions, the CoS becomes a key figure in creating stability, ensuring continuity, and supporting both outgoing and incoming leadership. In mature organizations, the role focuses more on optimizing processes, driving long-term development, and ensuring that the strategy is effectively implemented. The CoS must be prepared to renegotiate its mandate and adapt working methods to the needs and change phase of the organization.