Curriculum Theory (CT) is an academic discipline devoted to examining and shaping educational curricula. There are many interpretations of CT, being as narrow as the dynamics of the learning process of one child in a classroom to the lifelong learning path an individual takes. CT can be approached from the educational, philosophical, psychological and sociological perspectives. James MacDonald states "one central concern of theorists is identifying the fundamental unit of curriculum with which to build conceptual systems. Whether this be rational decisions, action processes, language patterns, or any other potential unit has not been agreed upon by the theorists." Curriculum theory is fundamentally concerned with values, the historical analysis of curriculum, ways of viewing current educational curriculum and policy decisions, and theorizing about the curricula of the future.