The aim of this thesis is to develop an open-source internet platform, intended as support of the multi-parameter decision-making process’ realisation. The platform is independent of the use of an operating system. The application may be divided into two distinctions: the part of the model construction and the analytical part. This thesis encompasses the former distinction. It contains a detailed description of the methods and procedures of the model’s construction, as well as a description of technological selection and implementation. The intent is also the composition of an instruction manual for use of the created platform, with a description of the decision-making process steps, and a description of the functions implemented into the platform that support the execution of the decision-making process. An additional purpose is the development of an open-source application that will better serve the learning process in the Decision-making Systems course, than the commercial programme currently in use.