In "Kissinger: A Biography," Walter Isaacson discusses how secrecy in decision-making can be maintained by limiting involvement in the process. By excluding certain individuals, especially those who might disclose information, the decision-makers can ensure that sensitive matters remain confidential. This approach highlights the balance between transparency and the necessity of keeping certain aspects of governance under wraps. Isaacson's analysis emphasizes the challenges faced by leaders when they must navigate the need for private discussions, especially when it comes to matters that could impact national security. The decision to limit who has access to specific information is a crucial strategy for preserving secrecy and minimizing potential leaks to the press or Congressional committees.