This thesis is mainly a critical examination of Professor R.M. Dworkin's recent attack upon the theory of judicial discretion. Dworkin is concerned to attack the theory in all of its forms, but he uses Professor H.L.A. Hart's version as his principal target. The examination therefore concentrates on Dworkin's attack upon Hart. Following a short Introduction, Hart's theory of adjudication andits constituent theory of judicial discretion are investigated in chapter two. In the remaining four chapters Dworkin's response to hart's views is considered. Chapter three isolates four main themes around which Dworkin centres his attack: that hart's theory (a) fails to distinguish weak and strong discretion, (b) is morally and politically unattractive...