An Instructional theory is "a theory that offers explicit guidance on how to better help people learn and develop." Instructional theories focus on how to structure material for promoting the education of human beings, particularly youth. Originating in the United States in the late 1970s, instructional theory is typically influenced by three general influences in educational thought: the behaviorist, the cognitive, and the constructivist schools of thought. Instructional theory is heavily influenced by the 1956 work of Benjamin Bloom, a University of Chicago professor, and the results of his  Taxonomy of Education Objectives — one of the first modern codifications of the learning process. One of the first instructional theorists was Robert M. Gagne, who in 1965 published Conditions of Learning for the Florida State University's Department of Educational Research.