The regulation of inert ingredients and adjuvants, just as for active substances, is undergoing change in the European Community (EC). The EC is moving toward a harmonized, community-wide approach toward adjuvants and inert ingredients. While a Directive (91/414/EEC) and implementing regulations have been issued for active substances, the approach to adjuvants and inert ingredients was still being debated in spring 1994, although issuance of a revised Directive 91/414/EEC covering these substances was originally expected by the end of 1993. Until issuance of the Directive, these substances will continue to be regulated by individual Member States.