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"In general, a deaf or hearing-impaired child knows fewer words than a child who can hear well. Researcher Karien Coppens of the Netherlands Organisation for Scientific Research (NWO) discovered that the weakness in vocabulary is the greatest when it comes to difficult words for which an in-depth understanding of their meaning is required. A limited vocabulary is the most important cause of problems in reading comprehension. An electronic vocabulary test, which will be used in primary schools for children with special needs, has been developed on the basis of the research results. Coppens gained her doctorate from Radboud University Nijmegen on 5 October 2012."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2012-11-deaf-children-vocabulary-words-difficult.html>