(8)The technical screening criteria for determining under which conditions an economic activity qualifies as contributing substantially to the sustainable use and protection of water and marine resources should reflect the need to achieve good status for all water bodies and good environmental status for marine waters, and to prevent the deterioration of water bodies that already have good status or marine waters that are already in good environmental status. It is therefore appropriate to focus first on those economic activities and sectors that have the greatest potential to achieve those aims.