Most encyclopedias are arranged according to philosopher such as Aquinas, Kant, Marx, or by division of philosophy such as aesthetics, or logic. Others are arranged by school of philosophy such as Epicureanism, or Zen. Some are arranged by concepts, ideas and theories such as justice, number or rationalism. But NONE offer a comprehensive list of entries about the ideas women philosophers have developed. The Encyclopedia of Concise Concepts by Women Philosophers  is unique.