The European Commission, EU Member States and representatives of European industry and environmental NGOs gather at the European Integrated Pollution Prevention and Control Bureau, part of the EU's Joint Research Centre in Seville, Spain. Together, they make up Technical Working Groups, which provide input into the drafting of documents known as BREFs in what is known as the “Sevilla Process”.
The Sevilla Process is designed to agree upon what constitutes the Best Available Techniques (BAT) for pollution prevention and control. Requiring polluting industry to use 'BAT' to reduce pollution is a central feature of the Industrial Emissions Directive (IED). Once agreed, the techniques are laid out in Best Available Technique Reference Documents, or 'BREFs'.