In contrast to the grand theories of nursing, midrange or middle-range, theories are more concrete and more easily used to guide practice.69 Often synthesized from knowledge and derived from the work of nurses or persons in other disciplines, midrange theories focus on a specific phenomenon like pain or uncertainty. Midrange theories are designed to be used in practice. There are numerous opportunities for advanced practice nurses (APNs) to use midrange theory while providing and directing clinical care. Using midrange theory can assist with the transfer, application, and evaluation of knowledge across individual and groups of patients. “Descriptive theory provides a description of what is happening in a situation and reveals the components that exist in a situation.”69(p192)