The NSM-LDOCE research dictionary served as the basis for creating Learn These Words First. New non-circular definitions for colour, number and shape were written and tested, so these three tentative primes could be removed. Other definitions were improved to eliminate more than half of the 700 words used as "semantic molecules" in NSM-LDOCE.

http://learnthesewordsfirst.com/about/research-behind-the-dictionary.html

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