Nursing models are theoretical frameworks, first developed in the 1950s to provide guidance on the delivery of nursing care. There are many different types; however, they all provide direction on how to implement the care for an individual. A nursing model contains concepts, processes and goals that guide care delivery. They are seen by some as being too traditional and not always suited to contemporary care provision; this is because of the continuing drive towards evidence-based practice, which is often based on hard scientific facts.