1. Henderson defined nursing in functional terms: "The unique function of the nurse is to assist the individual, sick or well, in the performance of those activities contributing to health or its recovery (or to a peaceful death) that he would perform unaided if he had the necessary strength, will or knowledge. And to do this in such a way as to help him gain independence as rapidly as possible."b. Erickson described nursing to be the holistic helping of a person with their self care activities in relation to their health. this in an interactive, interpersonal process that nurtures strengths to enable development, release and channeling of resources for coping with ones circumstances and environment. 2. Nursing is a helping, independent profession that provides services that contribute to the health of people. Three essential components of professional nursing are care, cure and co-ordination. Caring aspect is rational and requires as nurse to understand the patients needs at a level that permits individualization of nursing therapies. To cure is to assist patients in understanding their health problems and to help them to cope. The cure aspect involves the administration of treatments and the use of clinical nursing judgment in determining, on the basis of patient outcomes, whether the plan is effective. Co-ordination of care involves organizing and timing the medical and other professional and technical services to meet the holistic needs of the patient. And often a patient requires many other services simultaneously in order to be well cared for. A professional nurse also supervises, teaches, and directs all of those involved in nursing care. So there are some guidelines are essential to check how the nurses perform professionally and how they exercise the care, cure and co ordination aspects of nursing. As an independent profession, nursing has increasingly set its own standards for practice. This is called standards of nursing care.3. Theory is a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained4. Nursing theory is an organized framework of concepts and purposes designed to guide the practice of nursing.5. 6. Paradigm is Intellectualperceptionor view, accepted by anindividualor a society as a clear example,model, orpatternof how thingsworkin the world.7. Person, Health, Environment and Nursing8. Grand Theory is a complex and broad in scope and may incorporate numerous other theories. They are comprised of relatively abstract global concepts that attempt to explain broad areas in a discipline.Erickson, Tomlin and Swain- Modeling and Role-Modeling theory.9. Mid- range Theory is narrower in scope than grand nursing theories and offers an effective bridge between grand nursing theories and nursing practice. They present concepts and propositions at a lower level of abstraction and hold great promise for increasing theory-based research and nursing practice strategies.

Kathryn E. Barnard-Parent-Child Interaction Model.