These criteria include the size and complexity of an installation, its proximity to urban areas and valuable ecosystems, air and water emissions and waste discharges, compliance behaviour, and the operator’s management attitude. The GESTIGAOT helps to harmonise inspection reporting. Changes are continuously being made to update and fine-tune the risk-assessment tool, e.g. as additional hazardous substances are added to the risk criteria. Data are updated after every inspection, as well as through European Pollutant Release and Transfer Register (E-PRTR) reports from the APA. Routine inspections accounted for 90% of the total (IMPEL, 2009).