The subject of the article is the models and mechanisms for managing the competencies of IT services users applied as intellectual support of decision-makers on issues of professional retraining and professional development of personnel. Models and mechanisms correspond to two problem situations, requiring, respectively, the implementation of a unified or personalized approach to the competencies formation, and are an integration of expert information, models of scalar and vector optimization, game models, as well as discrete optimization methods, simulation and game modeling. The use of the proposed models and mechanisms is demonstrated by examples of the formation of professional retraining and development programs for users of ERP system. However, they can be used to manage the competencies of specialists in other fields.