<![CDATA[Students` vocabulary size plays very important role toward their success in learning new language. To succeed in language learning 2,000 word families is often mentioned. Having this number, a reader can understand nine from ten words in many written text. Right now, researchers propose number at least 3000 word families and mastering minimum 3000 word families will support students` success in academic reading at university level. To pass tests such as Cambridge First Certificate, TOEFL or IELTS. Vocabulary of 5,000 words are needed. Undergraduate non-native speaker of non-European countries could study successfully in English speaking countries by having word families around 5,000-6,000. A non-native speaker can study PhD level well with vocabulary about 9,000. This article also will discuss the techniques to estimate someone vocabulary size.]]>
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