Double majors are allowed to have 2 overlaps. If you have more than 2 overlaps, you will only be allowed to apply the additional overlaps to one major or the other. Please indicate on your Double Major form which courses are your additional overlaps and which department they are counting toward. You can also email this information to the Undergraduate Registrar at undergrad.polisci@yale.edu.
This is important because if you decide not to count one or more of your Political Science courses toward your Political Science major, those courses can then no longer be used to fulfill any of your major requirements. These courses do, however, count toward your chances of receiving distinction.
Overlapping courses may not include the senior essay or senior project, unless the essay or project is unusually substantial and represents at least the minimum essay or project requirements of both majors. (See next question for more information.)