Three dictionaries are compared for their usefulness to teachers of English as a foreign language, teachers in training, students, and other users of English as a foreign language. The issue of monolingual versus bilingual dictionary format is discussed, and a previous analysis of the two bilingual dictionaries is summarized. Pronunciation symbols, use of the syntactic codes, and problems of lexical collocation are examined. The "Longman Lexicon" is considered separately, and several earlier reviews and criticisms are addressed. It is concluded that the "Lexicon" has uses for the student and teacher that go beyond the capabilities of the dictionaries and many other references. (MSE)