Relevance. The study is devoted to determining the substance of representation given by a third party and their place among the general models of third party participation in another contractual obligation (Articles 312, 313 and 430 of the Civil Code of the Russian Federation). The possibilities of applying the current rules of positive law on the participation of a third party in another contractual obligation to representation provided by a third party are analyzed. Due to the presence of only explanations of the Supreme Court of the Russian Federation on such representations, there is a need for scientific formulization in this regard.The purpose of the article is to formulization theoretical provisions on representation provided by a third party and their relationship to existing models of third party participation in another contractual obligation.Objectives. to determine the most appropriate rules for applying to representationы given by a third party on a specific model of a third party's participation in another contractual obligation.Methodology. The author used dialectical-materialistic method, methods of analysis and synthesis, a systematic method, as well as methods of description and formal-legal method.Results. Based on the results of the study, it was found acceptable to apply the rules on contract in favor of a third party (Article 430 of the Civil Code of the Russian Federation) to the construction of representation provided by a third party.Conclusion. The structure of representation given by a third party proposed by the Supreme Court of the Russian Federation should be properly integrated into the existing domestic system of contract law. However, it has been revealed that the legal substance of the representation provided by a third party is not acceptable for all general models of third party participation in another contractual obligation. The closest model of a third party's participation in another contractual obligation to the construction of representation provided by a third party should be considered a contract in favor of a third party.