In the mid 1960s, Imogene King formulated a conceptual nursing model with the thought that man are like open systems that interact with his environment (King, 1981). She started to formulate this model, together with the Theory of Goal Attainment, during the period when nurses were trying to be scientists and professional practitioners. King intentionally designed a conceptual nursing framework as a forerunner to a theory that explains the rationale for the actions of nurses (Fawcett, 2001). The need to choose fundamental content of a new masteral nursing degree program prompted King to formulate her conceptual model (King, 1988).
Instructional theory is a discipline that focuses 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 divided into two categories: the cognitive and behaviorist schools of thought. Instructional theory was spawned off 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.
Renowned psychologist B. F. Skinner's theories of behavior were highly influential on instructional theorists because their hypotheses