loosely, a course of study in a school or college. More properly, it is defined as the overall rationale for, or essential principles and features of, an educational programme. An influential theorist, Ralph W. Tyler (1902-1994), outlined four key elements in curriculum: aims, objectives or purposes; content; methods or procedures; assessment. Curriculum is often used wrongly as synonymous with syllabus, which is in fact the term for curriculum content ( see also related terms such as formal curriculum, hidden curriculum, total curriculum).