Below regulations, decisions and directives which are made using one of the EU legislative procedures, the EU also adopts measures in order to supplement and amend, or to implement, the rules set out in directives, regulations or decisions. Such measures are referred to respectively as ‘delegated’ and ‘implementing’ acts. For example, under Article 4 of Regulation (EU) No 1143/2014 on the prevention and management of the introduction and spread of invasive alien species, the European Commission adopts implementing acts in order to list plant species which are assessed as invasive alien species for the purposes of the Regulation.