Among the quality indicators (which affect example, the percentage of separated waste collection, the frequency, severity and incidence of accidents, the compliance with commercial quality standards as set by the AEEG and the Service Charters, the percentage of calls to the gas emergency services service with response times of less than sixty minutes, the percentage of investigations for leaks in the aqueduct system, the branch waiting times, the call centre waiting times, and the maintenance of quality and environmental certifications, Other incentive systems Starting from 2006, the incentive system for executives of the Hera Group has been linked to the balanced scorecard.