Nursing theory has an important effect on clinical practice and nurses use an abundance of theories in everyday practice. Nursing theory exists to guide practice and research and the results of research and practice can be used to challenge or change the theory. Theories cannot therefore be divorced from practice or vice versa. Vital Notes for Nurses - Nursing Theory explores the relationship between nursing theories and practice specifically analysing their origins, development, selection and use. It enables nurses and nursing students to evaluate theories critically and weigh their worth in an environment where nursing roles are changing and there are new workforce pressures on clinical practice.