Prejudices, misrepresentations and myths mislead nurses about the origins of nursing knowledge. Discipline of Nursing allows us to compare significant nursing figures: Florence Nightingale (Great Britain) and her equally valuable counterpart Valérie de Gasparin-Boissier (Switzerland). The two distinct training models proposed by these illustrious women have retained their relevance into the 21st Century since as early as 1859. The discipline of nursing seems to be arranged in almost geological layers of knowledge that we can distinguish by studying the traditions of nursing language. This book aims to provide a better understanding of the nature of services provided by nurses worldwide.