Spanish language journals and articles are systematically underrepresented in the ISI database and obtaining also unfavourable starting conditions when being evaluated by impact factor, a widely used metric for evaluating scientific journals. The scientific policy of Spain has since the 1980s focused on promoting the international diffusion of research from Spain not taking into consideration which language is used. The Spanish language has not kept pace with the development of language in various fields of knowledge. Writing in 2007, Daniel Prado noted that Google searches on Spanish terms do often not yield quality results, hampering the work of translators and editors. Scholar Enrique Alarcón explains the case of engineering where he posits three causes for the poor quality Spanish used in the subject; words exist but are unknown, confusion between similar but not identical concepts, and lack of precision when using terminology. The poor state of the Spanish language used in engineering may stem from the mishmash of engineering traditions and impossibility for individuals of having a classical education in multiple branches of engineering. Alternatively, the poor state of the language in engineering may derive from the lack of a previous tradition in certain subjects. By 2007, the Icelandic, Dutch, Danish and Swedish languages had ten to twenty times more financial resources invested in language care and improvement than Spanish, despite the small size of the communities and the economies of their respective countries. Scholar Rainer Enrique Hamel points at three arguments to promote the use of Spanish in science:  "Practitioners and policy makers" may not benefit from the adding up of new scientific information if it is not in a language they understand. An example of this are protected area directors in Spain who self-report to have language barrier difficulties with publications relevant to carry out their work.