 Sigma Delta ( " Sigma Delt " ) was the first sorority at Dartmouth College , founded in May 1977 as a chapter of the national sorority Sigma Kappa . In April 1981 , Sigma Kappa moved into a residence formerly inhabited by the Phi Gamma Delta fraternity . The local chapter at Dartmouth began to have differences with the national organization concerning religion in sorority rituals and an emphasis on men in national sorority songs . The Dartmouth chapter dissociated from the national organization in the fall of 1988 , becoming Sigma Delta . The classes of 1989 , 1990 , and 1991 that formed the new local sorority dedicated the new organization to principles of " strength , friendship , and acceptance of difference " . Since reorganizing as a local sorority , Sigma Delta has hosted at least one open party each term in addition to service events . Actress Connie Britton ( 89 ' ) was a member of the first local class and served as Sisterhood Chair during her sophomore summer . 
