the number of EMAS-registered organisations and sites. The EMAS (Eco-Management and Audit Scheme) is a voluntary environmental management system implemented by companies and other organisations from all sectors of economic activity including local authorities, to evaluate, report on and improve their environmental performance. The scheme integrates ISO 14001 (International Standard for Environmental Management System) as its environmental management system element. Since April 2001, corporate registrations are possible, wherein organisations gather all their sites under one registration number. The European Commission started to collect numbers of sites in addition to number of organisations in March 2004 to give a more accurate picture of EMAS development.