The reason that Specialized was based on Special English is related to their respective usage. They are not primarily teaching tools (even though they are popular as an aid to learning) but communication tools. The choice of words in the 1500 word list depends to a degree on what is to be communicated. Most of the words are the most frequently learned, most commonly used English words. Both tools use these words. But many words are chosen for the intended purpose. For example, Special English uses words a US government news service might need, such as Congress, federal, administration, capitalism and recession. Specialized replaces some of these words with words used for religious subjects, such as blessing, prayer, miracle, and faith. The Specialized English word list has been revised in 2000 and 2007, in the light of experience. Still, the overlap of the two vocabularies is 91.3%. The Specialized English word list allows greater breadth of meaning in some of the words used in both lists. For example, the word 'joint':