The Italian Constitutional Court, in its constitutional interpretation, has become one of the main drivers of the 1948 Italian Constitution’s “silent transformation and accommodation”. This has been possible because, since its early years, the Court has developed a rich variety of techniques not explicitly provided in the constitutional text or in the Constitutional Law no. 1 of 1953 (on the functioning of the Constitutional Court). In this context, in its dialogue with Parliament, the Court developed “additive judgments”, namely rulings whereby the Court declares a statute unconstitutional, not because of what it provides for, but rather of what it does not provide. In this way, the Court manages to insert new norms into the legal system that cannot be found in any statutory text, transforming itself –or so it would appear– into a creator of legal rules. This Chapter analyses the functioning of additive judgments within the Italian Constitutional system and the effects they may provide on legislative decisions.