This document summarizes different theories of curriculum. It discusses four main groups identified by Herbert Kliebard: mental disciplinarians/humanists who believe in developing reasoning; social efficiency educators who aimed to design curriculum to optimize students' social roles; developmentalist/child study theorists who focused on students' developmental stages; and social meliorists who saw education as tool for social reform. It also outlines John Dewey's progressive curriculum theory and the social efficiency ideology of early 20th century theorists like Bobbitt and Thorndike. Finally, it discusses the importance of culturally diverse curriculum that represents minority students.