The blunt end sharp end human performance framework is useful for explaining nursing in that

Most of the nurses are at the sharp end. The blunt end sharp end human performance framework is useful in explaining nursing in that the framework represents how work is actually accomplished successfully in complex work environment. 
Sharp end- the actualizer of the process-the person actually doing the task (e.g., the nurse administering a medication; the surgeon holding the scalpel)
Blunt end- parts of the process farther away from the action itself. At its extreme, the blunt end is the environment in which we healthcare. Regulators, accreditors, administrators and designers function at blunt end.