regions speaking a variety different from their own. The weakness of the standard form's influence on spoken language had made standardization a marginal issue in the past, but it now became an important subject for debate. The lasting influence of linguistic centralism has led some commentators to claim that the problem of fragmentation is non-existent, and that it is enough simply to emulate educated language. One author, for example, repeated the doctrine of Menéndez Pidal when stating that: In any event, in the sphere of spoken language the issue has become problematic since at least the 1950s, when the commercial demands on movie dubbing studios working with Hollywood films began to call for the development of a Spanish whose pronunciation, vocabulary, and grammatical features would not be recognizable as belonging to any particular country. This goal soon proved to be an elusive one: even if the results could, on occasion, approximate a universally intelligible form, at the same time the process prevented the transmission of a familiar, intimate, or everyday tone. Nevertheless, its continued use has produced a degree of familiarization with a certain abstract phonetics throughout Spanish America. Dubbings made in Spain, are very particularly localized. At the First International Congress of the Spanish Language, held in 1997 in Zacatecas, Mexico, controversy emerged around the concept of Standard Spanish. Some authors, such as the Spanish writer José Antonio Millán, advocated defining a "common Spanish", composed of the lowest common denominator of most dialects. Others, such as the journalist Fermín Bocos (director of Radio Exterior de España), denied the existence of a problem and expressed the idea of the supposed superiority of educated Castilian Spanish over dialects with more influence from other languages. Finally, experts from the Americas such as Lila Petrella stated that a neutral Spanish language could possibly be developed for use in purely descriptive texts, but that the major variations among dialects with regard to semantics and pragmatics would imply that it is impossible to define a single standard variety that would have the same linguistic value for all Spanish-speakers. Above all, certain grammatical structures are impossible to form in a neutral way, due to differences in the verb conjugations used (e.g. the use of the second-person familiar pronoun vos in Argentina, Uruguay, Paraguay, and Central American countries, while most other countries prefer tú, and most Colombians tend to use usted in the informal context—and all three