O.A.S.I.S. (Organizations Assisting Schools in September) was a grassroots organization founded in Atlanta, Georgia, in 1961 to implement the “Atlanta Plan” for the desegregation of public schools. O.A.S.I.S. emerged from an earlier group, H.O.P.E., Inc. (Help Our Public Education), which began as a parents' study group aimed at keeping Atlanta public schools open during a period in which the Georgia General Assembly considered closing them rather than integrate, called the Sibley Commission. By 1961, H.O.P.E., Inc. considered the initial goal of simply keeping schools open during integration to be fulfilled, and focused O.A.S.I.S. on the peaceful desegregation of Atlanta’s schools in the Fall of 1961. Frances D. Green (1910-?) was a member of O.A.S.I.S. and an Atlanta city school counselor.

O.A.S.I.S's primary goal was to make known to every Atlantan the facts of the city's integration plan and its effects upon the public school system. To do this, the group sponsored meetings with students and parents and established a Speaker’s Bureau which supplied discussion leaders for civic, religious, and professional groups. O.A.S.I.S. also formed sub-committees around youth-serving agencies, church groups, and neighborhood associations. These sub-committees included members of civic and religious organizations such as the Atlanta Chamber of Commerce, the Atlanta Council of Churches, and H.O.P.E., Inc. itself. Atlanta’s synagogues, the Jewish Community Council, the Catholic Church, and over fifty other civic, professional, and business organizations supported O.A.S.I.S. Membership included white, multi-racial, and African American organizations.