The objective of the dissertation is to propose a model for eliciting tacit knowledge in contract management of outsourced services (CMOS), aiming to share and use it in decision-making processes and in solving problems in this management area. It seeks to demonstrate the model s applicability by developing an empirical study with one of the contract managers of a company in the oil and gas sector. The methodology comprised: (i) bibliographical review and documental analysis on the central themes of the research; (ii) content analysis of models, methods and techniques for eliciting tacit knowledge in organizations in general; (iii) development of a conceptual model for eliciting tacit knowledge in CMOS, integrating multicriteria decision-making methods in two phases of the model; and (iv) demonstration of the applicability of the conceptual model, by carrying out an empirical study in one of the contract management areas of a large company in the oil and gas sector. The empirical study demonstrated that it is feasible to elaborate plans to elicit tacit knowledge in contract management of different types of outsourced services (OSs). The main result of this research is an innovative model for eliciting tactical knowledge in CMOS, which can be applied by organizations seeking excellence in contract management of outsourced services. For the oil and gas company in which the empirical study was developed, the implementation of tacit knowledge elicitation plans covering all types of required outsourced services will contribute to enhance efficiency in contract management and strengthen its competencies in CMOS, with impacts on its competitiveness, value creation/capture, and innovation.