  :: You will see references to dyslexia in different langauges, and different countries. Most of the research of the last century was done based on the use of the English language. However this may not have been the best language to use as a basis to research dyslexia. This more to do with the structure of language, and the history of language development. The best place to start is with writing systems or the type of graphic symbols used to represent the sounds of speech. The purest form of writing system is a single graphic symbol representing a single word, a logographic writing system, such as Chinese or Japanese. The most complex writing systems are alphabets, such as the Latin alphabet (which is what we are using now) An alphabet tries to have a single graphic symbol (letter) to represent the sounds that make up a word. (and combinations of letters to represent sounds (forgotten the technical term)) The differences between these writing system structures is called differences of orthography. There are many other different types of writing systems with differing structural natures. ::Next within the Latin alphabet writing system there are a range of different langauge structures, orthographies, most of European origin. The purest languages in the Latin Alphabet are Finnish and Italian, the most complex language is English, again there are many other languages with varying complexities or types of orthography. ::These different writing systems, and langauges within writing systesm require subtly different cognitive skill combinations to process the type of graphic symbols being used, which is why dyslexia is language dependent. So for instance there was a case of a child bilingual in Japanese and English but only dyslexic in English. ::I hope I have not confused you too much.   