Very Effective!!!!
I have been on the Billings Ovulation Method for a few years now and beleive me, if you don't cheat it is 99.99% effective. The downfall to this method is that you are not suppose to know exactly how to use it without instruction. There are ways to contact these instructers that can guide you through the process for a fee. Check with your local womens center or life center, they can help. I was able to go through my training course right here in my home for thirty dollars, and you don't have to be Catholic to use it. Good luck to you.

PS.. I did get pregnant during the time of practicing this method but it is because we chose to cheat on my most fertile day. An Anniversary and a few drinks will impair judgement like that so be careful...lol

Promotes the method but doesn't teach it
This slim book promotes the Ovulation Method, profiling its advantages and utility. But it is not an instruction book. I'm only giving it three starts because although it's well-written I'm not sure who the intended audience is, or what group might find it useful.

For someone looking to learn a mucus-only method, I would look to "The Billings Method:Controlling Fertility Without Drugs or Devices" by Evelyn Billings. For someone just interested in any kind of fertility charting, not specifically a mucus-only method, I highly recommend Taking Charge of Your Fertility by Toni Weschler as the definitive book in this category.

Well worth it!
The ovulation book was great. The book was a good price, it was packed full of information and came with a chart and pleanty of stickers to get you and your spouse started on the wonderful journey of natural family planning.

Could be Better
I was hoping that the book went into better detail. It did not help me. However, it was informative and an easy read.

Simple and quick
You can read this book in 30 minutes and understand it. After ordering this book I was recommended "Taking Charge of your Fertility" by a friend. Taking Charge is more complete but uses this information, however. By the time my amazon.com shipment arrived with the second book, I was already pregnant from the first time trying The Ovulation Method (we had tried to get pregnant approximately a year before getting this book). So read it. You can also use it to avoid getting pregnant. It works!