This thesis investigates the modalities through which the International Court of Justice complies with the obligation to provide reasons for its decisions. Reasons are analysed using a taxonomy composed of typologies of reasons and attitudes and considering different benchmarks (audience, historical context, type of judicial act, norm, issue area), with the aim of identifying trends. Ultimately, through a comprehensive study of reasons, the thesis will shed light on the perception and self-perception of the role and identity of the Court, its practice, and its agenda.