System for enhancing existing quality monitoring tools for monitoring and guiding agent performance within call centers, each of which provided with a plurality of agent terminals, a plurality of agent audio interfaces, and a plurality of software applications. The proposed system comprises a module for quality evaluation of agents skills and/or of compliance with business processes; a database for storing the results of the evaluation module, in the form of a plurality of profiles of performance; a Call Analysis System (CAS) connected to the database and with the software applications, for retrieving the profile of performance associated with an agent and for generating and transmitting a visual or textual or audio input regarding corrective and/or preventive action(s) required during the current interaction, to an agent terminal, based on the performance profile, and/or on acquired real-time call-based information, as defined by predetermined criteria.