The phenomenon of pre-conditions, or to coin a phrase 'World Trade Organization (WTO) conditionality', from an implementation perspective has not been widely considered as such. Yet 'pre-conditions' as a technique for ensuring or facilitating the observance of the WTO code are a method employed by the WTO. It is of particular significance at the time of the accession of a state. This chapter focuses on accession alone but the observations are of general relevance. Under Article XXXIII of GATT 1994 accession by a government is permitted, so that an entity that is not a state or a nation can also be a party to the agreement. The chapter illustrates account from the report of the Working Party on the accession of El Salvador.