This course is intended to introduce the fundamental principles that make up Catholic Social Teaching (CST) from the end of Second Vatican Council to the current papacy of Pope Leo XIV. This course builds upon the two previous courses in this sequence, CST 500 and CST 510, by drawing upon the philosophical, anthropological, and theological ideas that have guided the earlier tradition of CST. After having reviewed the main lines of CST from Pope Leo XIII to the Second Vatican Council in CST 510, this course focuses on the challenging and dynamic period following the Second Vatican Council. The Primacy of the Human Person, Theology of Work, and Method for Social Engagement are some of the central themes of the course.