This little book has been our go to book often. It is not a teaching book, but rather a book of quick answers listed alphabetically. For example if you are trying to determine whether you should use affect or effect in your sentence, you can turn to the a's or the e's and find the answer listed. As Americans working in England, both my husband and I appreciated the attention to spelling and usage differences between the two countries as in dependant vs. dependent. For semicolon issues, you look under "s" and so on. Of course it does not have every answer you could ever need, but for the most part it has been helpful about 90% of the time. There are some really silly answers in the book, such as, use didn't not did'nt. Seriously, if you have to look for help on that then you need something more like a lesson book. However, something had to fill up all those pages. The book we have has a different cover than shown in this picture and it is the third edition. (We bought it in England.) We are now living in the United States again and our offices are in different locations. My husband has been calling me to look up the occasional problem for him in this book. That is rather annoying so I turned to Amazon.com to get him his very own copy. By the way, we also like the "Oxford A-Z of Grammar and Punctuation" by John Seely. This book is arranged the same way but much more grammar focused (no spelling) and more technical. The two together are good desk references.