Pi Sigma Alpha is the national honor society for graduate and undergraduate students of political science and international relations.

Membership requirements:

• a cumulative GPA that puts the student in the top third of their class
• at least junior class standing
• a cumulative GPA of 3.50 or higher in at least 12 political science hours with a significant portion of these hours taken at Truman State University

For majors near the line on these requirements and for political science and international relations minors, the political science and international relations faculty has the right to make judgment calls concerning admittance to the organization.  The Theta Tau chapter also, from time to time, admits persons to honorary membership in Pi Sigma Alpha who have excelled in some manner in the political sphere.