history: Working as a nurse, there are many times when I have been worried about my patients. Sometimes when a patient is just starting to get seriously ill, there are not any obvious signs, but my intuition is almost always correct.
current: Intuition can be a key tool to a seasoned nurse. 
next: I suppose, but research and concrete knowledge is more beneficial as it is a very hands on and physical occupation, especially when the health of others are in their hands.