The techniques to develop, enlarge a vocabulary, this also helps to make your use of words more elastic, more apt, and by means of generous lists and tests puts theory into practice. The use of correct words, good short words, word families and word derivation; synonyms and antonyms; slang, triteness, and equivalents; prefixes and suffixes; definitions; these a few of the categories to give you sound word knowledge so that you may increase, improve your word usage... One of many in this field, but a practical addition.