The 600 words in each book of this series along with the additional target words presented in the appendices included in the first three books of the series are the most useful words in English. They were found by analysis of a collection of English course books from various levels in the primary, secondary and tertiary school systems. The words included in this series were chosen because they occurred many times in different levels of these materials. Book 3 includes 30 units, please refer to the documentation for more details. |
