THE GENERAL SERVICE LIST (GSL)
These 1000 words are selected from General Service List (GSL) published in 2000 by J. Bauman. It contains the 2000 (in our case1000) most useful headwords in English language. On average, the GSL represents 82% of words used in English (Nation, Waring: 1997).
After knowing these words, a learner will able to do all general level readings such as newspaper, magazine, and course level readings for 8th grade or less level.
 
GSL includes vocabulary items required for the following exams:
Cambridge Young Learners of English (YLE) at all levels: Starters, Movers and Flyers, and Cambridge Key English Test (KET). This vocabulary range is necessary to communicate easily at A1 and A2 levels, according to The Common European Framework of Reference for Languages.

With the use of the vocabulary at elementary level, the learner can easily describe basically all the meanings in a given language. Mastering this set of vocabulary items allows the learners to understand the spoken and written language and to talk about basic everyday topics. It also helps student to understand 1000 words in General Academic List (GAL) and 1000 words in General Test List (GTL).