Legal realists believe that legal science should only investigate law with the value-free methods of natural sciences, rather than through philosophical inquiries into the nature and meaning of the law that are separate and distinct from the law as it is actually practiced. Indeed, legal realism asserts that the law cannot be separated from its application, nor can it be understood outside of its application. As such, legal realism emphasizes law as it actually exists, rather than the law as it ought to be. Locating the meaning of law in areas like legal opinions issued by judges and their deference or dismissal of the past precedent and the doctrine of stare decisis, it stresses the importance of understanding the factors involved in judicial decision making.