In this report we present an interactive multi-objective optimization tool that was developed as part of this graduation project. This appliance is meant to be used as a decision support tool for transportation planners working on a synchromodal transportation network on the container-to-mode assignment, where different attributes are considered important. The tool offers the planner a range of solutions according to her/his preferences, and offers the opportunity to seek for new ones if the planner is not satisfied with the solutions found so far. Before presenting the tool, a framework for synchromodal transportation problems is introduced (which was developed as part of a collaborative work with two other students and two supervisors). Then an analysis is done on mathematical modeling approaches of container-to-mode assignment, with special emphasis on computational time, given the time-sensitivity of this problem on synchromodal transport networks. From this analysis a model is chosen on which to built upon the multi-objective optimization tool, for which a thorough analysis on the attributes to be considered is carried out.