After loosing my older edition of a Roget's Thesaurus that I acquired several years ago, I was thrilled to get my hands on the newest release. I love the set up, and that there are so many more words than other thesauruses, but am quite disappointed with the index.
In the earlier edition I owed, almost half of the book was made up of the index, I am pretty sure nearly every word in the thesaurus was listed in the there. And although it was a lot to get through to find a single word, it was useful for other things, such as a finding the spelling of a word, or perusing through a section when I couldn't think of exactly what word was coming to mind.
The index in this edition is pathetic by comparison. It takes up less than five percent of the size of the book. Automatically, that tells me that only about five percent of the words in the book are indexed, which is a terrible waste. Why even have an index at that point?
I do not intend do stop using this thesaurus just because I can no longer trust the index to be a great source of help. I'm sure I'll eventually learn how to locate words using the Synopsis of Categories at the beginning of the book. But I will greatly miss the extensive index of my previous edition.