Akademici rozlišují čtyři různé modely (severský, anglosaský, kontinentální a středomořský) s rozdíly (v míře ochrany, prostoru pro iniciativu jednotlivce), ale i se společnými prvky.
Commission Regulations (EC) No #/# and (EC) No #/# lay down the detailed rules for the implementation of the second stage of the programme of work referred to in Article # of Directive #/#/EEC and establish a list of active substances to be assessed, with a view to their possible inclusion in Annex I to Directive #/#/EECnot-set not-set