Problem: The four theorists: Florence Nightingale's environmental model of nursing, Virginia Henderson's 14 components of basic nursing care, Dorothy Johnson's behavioral system model, and Nola J. Pender's health promotion model viewed nursing from various perspectives, yet they fundamentally agreed on the concepts of interest to the nursing profession, thereby influencing the evolution of nursing as a discipline and framing nursing knowledge. How has the development of these and other nursing theories helped to frame this knowledge and shape the role of the APN?