Perennialism is a specific educational philosophy and is derived from ancient Greek philosophies such as idealism and realism. One of the major tenets of perennialism is that knowledge that has withstood the test of time is what is needed to be taught. The goals of education have been the same throughout time. Human nature is constant and mankind has the ability to understand the truths of nature.
Common characteristics of a perennialist curriculum is a subject centered lessons, organized body of knowledge, and a focuses on developing the thinking skills of students. Lecture, question, and answer are common instructional methods. There is no difference among students and everyone learns the same thing at the same speed. The “three Rs” are one form of this type of curriculum.
A more recent view of perennialism and the teacher is available here