National social changes also affected Greek societies at Dartmouth in the 1960s and 1970s. Many began to question the value of belonging to a national fraternal organization. The Dartmouth chapters of Alpha Chi Rho, Chi Phi, Delta Upsilon, Phi Gamma Delta, Phi Kappa Psi, and Sigma Phi Epsilon all disaffiliated from their national fraternities in the 1960s. As political activism increased, fraternities were increasingly seen as anachronistic, and in 1967, the faculty voted 67-16 to adopt a proposal to abolish fraternities at Dartmouth. The proposal was rejected by the Board of Trustees. Coeducation would dramatically change all social life at Dartmouth College, including the fraternity system. The college first began admitting women as full-time students in 1972. By the fall of 1973, five local fraternities (Alpha Theta, Foley House, The Tabard, Phi Tau, and Phi Sigma Psi) had all decided to adopt a coeducational membership policy and admit women as full members. The first sorority on campus, Sigma Kappa, was founded in 1977. Many alumni expressed strong concerns that the need for housing for new sororities would inevitably lead to financial pressure and the possible dissolution of existing fraternities at the college. In response, the Trustees imposed a moratorium limiting the campus to no more than six recognized sororities. Converting from an all-male to a coeducational membership policy was not enough to save at least one Greek organization on campus. In 1981, the Harold Parmington Foundation reorganized itself as a new coeducational fraternity Delta Psi Delta, but the organization never attracted many new members and was finally forced to dissolve in the spring of 1991. In addition, Foley House disassociated from the Greek system in fall 1984, transitioning into an affinity house as part of the college's residential living programs. It moved off Webster Avenue to a new location on West Street (where it is still in operation )." During the 1980s and 1990s, College administrators introduced new initiatives to hold the Greek organizations on campus more accountable for their actions and to offer more social alternatives to the predominantly single-sex Greek system. In 1982, the administration announced that Greek organizations would have to comply with a set of "minimum standards", enforced through annual reviews, in order to remain in good standing with the college. These standards included not only health and safety regulations regarding the conditions of the Greek houses, but requirements for Greek-sponsored activities deemed beneficial to the college community at large. The College introduced Undergraduate Societies to campus in 1993, as a residential and social alternative to Greek organizations.