The outsourcing of logistic activities has consolidated itself as a trend in diverse industrial segments. Being logistic a factor of great impact in the competitiveness of the companies, the decision for contracting a Logistic Operator has, as main reason, the strategic decision of concentrating on its key activities, leaving the logistic services to specialists. The necessity of companies to focus on its key activities and also to increase its competitiveness, together with the desire of the logistic operators in supplying services of greater added value, has worked as a catalyst of the logistics outsourcing process. Such development is characterized on the figure of the Fourth Party Logistics (4PL). The 4PL´s basic objective is to provide an efficient logistic integrated solution, managing all logistics activities and service providers that should be necessary. As form to assure that the logistic activities commissioned to specialists, are they 3PL or 4PL, are being played inside the standards established in contract, the contracting companies need to develop tools to measure the performance of its operators. The master thesis intends to search theoretical references for performance evaluation model applicable to Logistic Operators. At the end, it is intended to present a model that better fits to measure Logistic Operators performance, in the thermoplastic resin industry segment. Finally, it is expected to prove the hypothesis that it is possible to measure the performance of Fourth Party Logistics Parties in this segment.