This project uses dynamic simulation to assess the effectiveness of child restraint systems for various installation configurations in the cases of both frontal and side impact. For this purpose a model was developed using the MADYMO software (essentially the part that uses the multibody method) while finite element modeling was used to model the wings of the child restraint system and the vehicle body to provide a better representation of the contact between the child dummy, the restraining device and the structure of the vehicle. The model was evaluated for a side impact but, in order to perform more thorough verification, frontal collisions were also considered. The study shows that ISOFIX lower anchorages provide a better protection for the head while the results for lower flexible anchorages and vehicle belt installations although generally similar are not as good. The top tether reduces head injury criteria, especially when vehicle safety belts or lower flexible anchorages are used, but has practically no influence when the child restraint system is installed using ISOFIX anchorages. The model will also allow to measure the effect of inadequate installation, such as caused by the play introduced in the child restraint system due to the use of winter clothing.