Aulis Aarnio addresses the question of how legal interpretations should be justified. Aarnio considers a justification to be rational only if the justification process has been conducted in a rational way, and if the final result of this process is acceptable to the legal community. According to Aarnio, a theory concerning the justification of legal interpretations should contain a procedural component specifying the conditions of rationality for legal discussions, and a substantial component specifying the material conditions of acceptability for the (...) final result. The procedural component of Aarnio’s theory formulates rules for the rationality of legal discussions. The substantial component specifies when the result of a legal interpretation can be called acceptable. Aarnio considers such a result acceptable if it is acceptable to a particular legal community in which there is consensus with respect to certain norms and values. (shrink)