When detailed information from comprehensive scientific monitoring is available, management plans are based on quantitative objectives and scientific advice stemming from the simulation of potential effects of alternative management scenarios (Box 12). In addition to these management plans, riparian countries and supranational entities such as the European Union also establish their own management plans, which should be compliant with the Agreement for the establishment of the General Fisheries Commission for the Mediterranean (GFCM Agreement) and in line with existing regional decisions. When available, simulations of the potential effect of alternative management scenarios are presented as they provide insights on the response of fisheries to the decisions taken.