The development of new models of work organization and the complementary advance of flexible guidelines for the use of the labor force had as a correlate a profound change in techniques for the evaluation of workers. Thus, the typical model of Fordism, based on qualifications, was replaced by a different one based on competencies, whereby the strong relationship of the former was abandoned with the determination of the technical knowledge required for each job to move to a system which the priority is placed in the individual attitude. The consequent individualization of performance evaluations can lead to a possible loss of objectivity. In this article we develop a theoretical comparison between the qualifications and the competencies models, and then analyze the effects of the competencies model on employment, work and labor relations in Argentina since the Menem government in the decade of the 90 until the government of Macri, ended in 2019. For this last analysis we used the survey of collective bargaining throughout the period