  A final justification for the doctrine of precedent is that it is desirable to give courts the power to make law. The thought here is that it is valuable for the courts to have the power to improve and supplement the law (Hart 1994, 135–6; Raz 1979, 194–201). The assumption underlying this justification is that the law is sometimes incomplete and in need of being given greater specificity, or that it is erroneous and needs to be corrected.  On this view the courts are analogous to delegated legislators: they have limited powers to make law within a broader framework of doctrine.