ACI courses 16, 17 and 18 are part of a series entitled The Great Ideas of Buddhism. They offer a sweeping view that illuminates the path and drives home the most crucial ideas of the first 15 of the ACI open teachings. These courses must be taken directly from a teacher so as to deeply imbed the teachings and to provide personal help where ideas have been forgotten or misunderstood. It is not necessary to have completed ACI courses 1 - 5 to take this course.