Several factors are influencing role expansion for registered nurses, among them the shortage of primary care physicians, the federal government, the physician's assistant movement, the growing complexity of acute hospital care, educational reform, and the women's liberation movement. As state licensure statutes are revised to allow for role expansion, the changing laws themselves become a factor supporting the movement.
有几个因素正在影响注册护士的角色扩展，其中包括初级保健医生短缺、联邦政府、医师助理运动、急性医院护理日益复杂、教育改革以及妇女解放运动。随着州执照法规的修订以允许角色扩展，不断变化的法律本身也成为支持这一运动的一个因素。
