On the basis of the analysis of the game of chess and chess rules, Chapter I proposed the working hypothesis that, in principle, it must be possible to define and explain the concept ‘scientifically valid (Danish, Swedish, etc.) law’ along the same lines as the concept of a ‘scientifically valid norm of chess’. This chapter attempts to develop this working hypothesis into a comprehensive theory about what the concept ‘scientifically valid (Danish, Swedish, etc.) law’ actually means. The working hypothesis implies that the law, like the rules of chess, is a supra-individual, social phenomenon. This means that the legal notions of action give rise to a common ideology which is active in most judges’ minds, thereby creating an interpersonal context of meaning and motivation effectively guiding their actions in office because the legal rules are felt to be socially binding. In terms of content, the legal rules are directives to the judges for organizing the exercise of specific coercion through the courts. These directives fall into two categories: norms of conduct; and norms of competence. The former prescribe a certain course of action. The latter create a competence (power, authority) which, in turn, means that they are directives to the effect that norms created in conformity with a given mode of procedure shall be considered norms of conduct.