1. A method for using a computer system to create a supplemental reference document to an electronic text comprising: a. providing a first wordlist based on the user's reading level; b. comparing said first wordlist with the text to generate a second wordlist; c. combining said second wordlist with a third wordlist to create a fourth wordlist; and d. creating a concordance based on the fourth wordlist.
2. The method of claim 1, wherein the combining step comprises adding text units from the third wordlist to the text units from the second wordlist to create a fourth wordlist.