The primary aim of this master's thesis is to explore the differences between the methods usedby the Belgian and Swedish Police in their investigations of online child sexual abuse in orderto answer my research question “What could those specialised teams improve?” The first partof this work is theoretical and provides information on the structure of the Belgian and SwedishPolice. This will be followed by a brief discussion of the role of Europol and Interpol in thefight against child sexual abuse, as well as a short chapter on cryptography to understand howinternational communications are conducted.The second part is about the practical part of this work. To collect the necessary information,the Belgian Police opened their doors, specifically to the Child Abuse section, for three days.They introduced their teams, equipment, current and closed investigations, and answered a pre-prepared list of questions.It was not possible to meet with the Swedish Police in person. Therefore, it was decided togather the necessary information through interviews. The questions were based on the timespent with the Belgian team.Once the information was gathered, it was compared, and a score was assigned to each responseprovided by Belgium and Sweden to give an idea of their accuracy and completeness.Subsequently, a list of recommendations was formulated with the aim of proposing areas forimprovement.The statistics presented at the end of this thesis allow for a visualization of the evolution of thenumber of assaults and investigations opened and resolved.