In modern 2026 project management and corporate strategy, stakeholders are typically categorized into five levels based on their influence and interest: 1. Primary Stakeholders (The "Internals" like employees, owners, and investors who are directly affected by the outcome); 2. Secondary Stakeholders (External groups like customers, suppliers, and creditors who have an indirect interest); 3. Tertiary Stakeholders (The community, government regulators, and trade associations who set the rules); 4. Fourth-Level Stakeholders (The "Influencers" like the media, competitors, and environmental groups who can shape public opinion); and 5. Marginal Stakeholders (Those with low interest and low power, like casual observers or distant neighbors, who still require minimal monitoring). Understanding these levels allows an organization to prioritize its communication efforts—focusing heavily on the high-power, high-interest "Primary" group while simply "keeping informed" the lower-level groups. This hierarchy is essential for managing "conflict of interest" scenarios, ensuring that the most critical voices are heard while the broader social and regulatory impacts of a project are not ignored.