This study aims to contribute to research on the relationships between the practices of SHRM, work engagement and results at the individual level: performance and intention to leave the organization (reverse). The bibliographical research demonstrated the multiplicity of Practices, Systems of Practices of SHRM, with convergences and divergences. The Amo framework for the definition of Practices has been shown, at least conceptually, as a robust and integrative model. Empirically, we find a strong association between the AMO oriented practices and the engagement, which undoubtedly contributes to the 'black box problem'. As for bibliographical research, the work engagement construct and its various theoretical lines, antecedents variables and measurement scales were analyzed. It was defined a theoretical model that relates the SHRM Perceived Practices, the individual results, the engagement in the work and relevant antecedent variables associated to the engagement, which was tested using Structural Equation Modeling (Lavaan-R), meeting the requirements of quality of fit (GOF), with parameters considered good. The focus of this research was to bring the work engagement construct to the academic debate in Brazil and its role in SHRM. Thus, in times of high competitiveness, we can say that one of the objectives of the SHRM must be linked to the promotion of levels of work engagement. In this study, the robustness of the construct and its measurement, the discriminant validity with other constructs and a direct significant association with respect to job performance and the Intention to leave (reversed) were proved. The hypotheses regarding the importance of engagement at work-whether in their direct association with the individual outcome variables or their indirect association in the relationship between the Practices of SHRM Perceived Practices, and Perceived Support and the consequent variables were confirmed in the sample. As contributions of the thesis to the Theory, we consider that the results of this thesis advances the understanding about the 'Black Box Problem' by demonstrating the strong positive association between the SHRM Practices and the work engagement and the latter with desirable behaviors and attitudes. Suggestions for future investigations as well as theoretical, methodological and practical implications are discussed.