As a beginner to the Arabic language, I was grateful to find this book. In the past, I've been subjected to dry-as-toast Arabic grammars that made NO sense whatsoever (because they often used jargon that would only be familiar to Arabic scholars with PhDs, probably). Wightwick and Gaafar's book is a nice, slim reference for basic Arabic grammar. What is particularly nice for the elementary student is that while grammar is shown in Arabic script (in my opinion, this is necessary for any Arabic guide worth its salt), the words are also transliterated so that the reader can accurately learn the pronunciation of a word.
HOWEVER, it should be pointed out that the subtitle is a little misleading. This is NOT a practical guide for the "mastery" of Arabic. While a great desk reference, it is still a good introductury Arabic grammar. There are other books for advanced grammar. This isn't it.
Also, this book is not for the absolute beginner. You should have a foundation in the Arabic alphabet and some basic vocabulary. This book teaches none of those things, just how a sentence fits together and various verb tenses.
Looking back on this review, I have to amend a few things. I began studying Arabic with a tutor and would add that while the pronunciation used in the book is close, sometimes it's inaccurate. Really, you need to use this book in conjunction with an Arabic course, because you won't be able to teach yourself. You NEED to hear the language firsthand, and flat words on paper aren't going to give you that.
Honestly, I recommend this more: A Reference Grammar of Modern Standard Arabic (Reference Grammars). This is a fuller, more complete picture of the Arabic language (so why waste your time on a very skinny intro grammar that occasionally makes transliteration mistakes?). Wightwick's book is a decent reference but really, for your time and money, you can do better.
I'd change the stars on my original review but unfortunately the edit option doesn't seem to allow me.