Ages. The term "classical education" has been used in English for several centuries, with each era modifying the definition and adding its own selection of topics. By the end of the 18th century, in addition to the trivium and quadrivium of the Middle Ages, the definition of a classical education embraced study of literature, poetry, drama, philosophy, history, art, and languages. In the 20th and 21st centuries it is used to refer to a broad-based study of the liberal arts and sciences, as opposed to a practical or pre-professional program. Classical Education can be described as rigorous and systematic, separating children and their learning into three rigid categories, Grammar, Dialectic, and Rhetoric. Essentialism Educational essentialism is an educational philosophy whose adherents believe that children should learn the traditional basic subjects and that these should be learned thoroughly and rigorously. This is based on the view that there are essentials that men should know for being educated and are expected to learn the academic areas of reading, writing, mathematics, science, geography, and technology. This movement, thus, stresses the role played by the teacher as the authority in the classroom, driving the goal of content mastery. An essentialist program normally teaches children progressively, from less complex skills to more complex. The "back to basics" movement is an example of essentialism. Social reconstructionism and critical pedagogy Critical pedagogy is an "educational movement, guided by passion and principle, to help students develop consciousness of freedom, recognize authoritarian tendencies, and connect knowledge to power and the ability to take constructive action." Based in Marxist theory, critical pedagogy draws on radical democracy, anarchism, feminism, and other movements for social justice. Democratic education Democratic education is a theory of learning and school governance in which students and staff participate freely and equally in a school democracy. In a democratic school, there is typically shared decision-making among students and staff on matters concerning living, working, and learning together. Progressivism Educational progressivism is the belief that education must be based on the principle that humans are social animals who learn best in real-life activities with other people. Progressivists, like proponents of most educational theories, claim to rely on the best available scientific theories of learning. Most progressive educators believe that children learn as if they were scientists, following a process similar to John Dewey's model of learning known as "the pattern of inquiry": 1) Become aware of the problem.