The first faculty and students of color arrived at the school in 1957 and 1959, respectively. The following decade ushered in a turbulent period for St. Paul's. In 1968, students wrote an acerbic manifesto describing the school administration as an oppressive regime. As a result of this manifesto, seated meals were reduced from three times a day to four times a week, courses were shortened to be terms (rather than years) long, Chapel was reduced to four times a week, and the school's grading system was changed to eliminate + and - grades (re-introduced in 2016) and given its current High Honors, Honors, High Pass, Pass, and Unsatisfactory labels instead of A–F. By the end of the sixties, St. Paul's had begun to admit sizable numbers of minorities in every class, had secularized its previously strict religious schedule considerably, expanded its course offerings, and was poised to begin coeducation. It admitted girls for the first time in 1971, becoming one of the first boys' boarding schools to do so. The Arts program was also expanded in the early seventies, while the interdisciplinary Humanities curriculum was introduced in the early nineties.