The present study, on noise source modelling, is carried out within the SHEBA- project, funded by BONUS. This project addresses many environmental aspects of shipping in the Baltic Sea region, and includes one work package for the investigation of noise from shipping. A review of ship noise source models is presented in this report, and lines of development are suggested for a methodology for noise source modelling suitable for Baltic Sea shipping. The proposed ship noise source modelling will be implemented in the software STEAM, used and developed at FMI. The STEAM software relies on ship operating information form the Automatic Identification System (AIS). In chapter 2, the framework of the noise source modelling is described. The connection to noise measurements for validation, sound propagation modelling, and the study of effect and impact on fish and marine mammals, is also described in that chapter.