Assessment of advantages and limitations of rockfall models require in-depth-knowledge in the rockfall field, testing of model with field investigated data, as well as understanding rockfall mechanics. This thesis intends to give an overview of currently in-use rockfall models and summarizes the conclusions of researchers regarding the advantages and limitations of the models which were employed in their research projects. The main part of the thesis focused on the two complete rockfall models, RAMMS::Rockfall and Rockyfor3D. The two models were employed in back calculation analysis based on the field investigation data of a rockfall event that happened at Holaviki in the Community of Vik, Norway and was reported by Norwegian Geotechnical Institute (NGI). The two models were compared, one versus another, by looking at requirement input parameters, trajectory simulation approaches and the outcome results. Each model has shown its advantages and also limitations for future developments. Applying those models in rockfall trajectory simulation is not a stand-alone approach, that does not disregard the important role of field observation data, case history data and scientist assessments that are essential for calibrating model parameters in order to improve simulation results
