In order to better approach the design, formation, writing and actual submission of a criminal report against a known and/or unknown perpetrator of a criminal act, it is important to know the division of criminality. For the purpose of harmonizing the competent organizational units, and in view of the complexity and territorial spread, it is important to know how crime is divided into the levels of local crime, regional crime and national crime. Accordingly, there is a division in relation to criminal investigations, in which investigations of criminal offenses are divided into cases of regular jurisdiction, cases of specialized jurisdiction and complex cases. Criminality is a term that denotes the commission of the most serious punishable behaviors, which we call criminal acts, that is, crime, and is maintained as the totality of committed criminal acts, all of them, of a certain type or committed by certain groups of criminals in a certain area in a certain period of time. Just as societies and social organizations differ from each other, punishable behaviors in each society are determined differently, that is, defined differently by legal regulations. The perpetrator of a criminal offense is considered to be a person who, through his actions, has committed illegal behavior, i.e. a criminal offense contrary to the legal provisions of a certain society for which sanctions (penalties) are prescribed, and in connection with this, against a known and/or unknown perpetrator, independently whether it is an adult or a minor, he submits a criminal complaint to the competent state attorney's office, which then initiates criminal proceedings or rejects the criminal complaint and submits all measures and actions taken to the competent court for a decision.