Dr. William Allan Kritsonis provides an overview of educational philosophies and their key concepts. He begins by explaining that philosophy is an attempt to understand the world and that educational philosophy applies formal philosophy to education. Some philosophies, like essentialism and perennialism, support a structured curriculum with close monitoring, while others like progressivism and reconstructionism focus on limited structure and student freedoms. The document defines various educational philosophies and their associated terms, such as idealism, realism, pragmatism, existentialism, and behaviorism.