This paper explained what comparative law is, and how comparative research can be conducted in Criminal Law. The usefulness of conducting comparative law investigations was also explained, as well as the comparison at jurisprudential level.

Finally, a comparative research method is described, which consists of six steps: defining the point of view and the field of observation; the individualization of similarities and differences; comparative synthesis; the explanation of similarities and differences; and the valuation. For this, the literature review technique was used. In it, it was concluded, among others, that the maximum aspiration of any comparative research is to become interdisciplinary.