In the Italian public entities the assessment of employees involves the use of two parameters: the performance objectives and the individual performance factors. The last ones concern the personal behaviors required in the workplace by employees under evaluation, and their measurement affects the construction of the reciprocal roles of the evaluator and the evaluated. Difficulties invest both: the evaluator considers that he/she does not possess technical tools and relational skills to manage this process; the evaluated tends to focus mainly on the economic and career consequences. The aim of this work is to help the manager to recognize the meaning dimensions underlying his evaluator activity and to become more effective and consistent as evaluator through the use of some constructivist tools. In this way it will be possible to encourage the evaluator to become more aware about the dimensions involved and the impact of his activity on the assigned personnel and on the whole organization.
 
Keywords: Evaluation (assessment), manager, employee, performance, measurement