To work in the nursing profession, all nurses hold one or more credentials depending on their scope of practice and education. A licensed practical nurse (LPN) (also referred to as a licensed vocational nurse, registered practical nurse, enrolled nurse, and state enrolled nurse) works independently or with a registered nurse (RN). The most significant differentiation between an LPN and RN is found in the requirements for entry to practice, which determines entitlement for their scope of practice. For example, Canada requires a bachelors degree for the RN and a two-year diploma for the LPN. A registered nurse provides scientific, psychological, and technological knowledge in the care of patients and families in many health care settings. Registered nurses may earn additional credentials or degrees.