Which of the following is NOT a method to promote information sharing within the federal government?

Utilizing classified channels exclusively is the correct choice, as it inhibits information sharing rather than promotes it. When information is kept strictly within classified channels, access is limited to a select group of authorized personnel. This lack of accessibility can prevent broader communications and collaboration that are essential for effective information sharing across different levels of government and with external entities.

In contrast, establishing communication with local governments, collaborating with coalition partners, and engaging with the general public all facilitate the flow of information. These approaches create opportunities for diverse exchanges, enable the pooling of resources, and enhance collective understanding of issues. Therefore, relying solely on classified channels does not align with the goal of promoting robust information sharing within the federal government.