If you are looking for a resource that complements existing Oracle Access Manager (OAM) documentation, with detailed use cases and deep explanations of hard to understand concepts, and troubleshooting tips, this is not that book.
I've been working with Oracle Access Manager for a few years, so I came into this book already possessing a fair bit of knowledge. With that background, this manual is sadly underwhelming. I had much greater expectations for value-add, but all it does is redeliver information that is in Oracle documentation. I could think of many places where the author could contribute by offering advice on how to architectural best practices, or describing complex usage scenarios or tasks that are otherwise hard to find or follow in Oracle's documentation, but there was nothing like that. No discussion about third-party directories (something that is VERY hard to do with the original version of OAM 11g), or DMZ and high-availability configurations (things that are buried in Oracle's documentation but vital for any production deployment).
There is the occasional tip here and there, but they are very few in number, and usually among the more obvious of errors/fixes.
The book was written to coincide with the original release of the product suite, which is a bit of a problem, because a lot has changed since then. The first patchset was released in May 2011, and many features have been revamped and UIs modified. There are one or two mentions of these changes, but the author does not go into detail, leaving the reader to figure out how the old functionality maps to the new one, and resulting in some very confusing and inaccurate sections. There is still no errata covering this on the publisher's web site. Six months of silence on this is way too long a delay, in my opinion. For what it's worth, though, the book is so short on architectural details, that many of the fundamental architectural changes are barely discussed anyway. I'm not sure which is worse.
The author spends a lot of time rehashing the flow of basic administrative tasks, but there is no explanation of what the administrator is actually doing (relative to the product's inner workings, OR the enterprise network) and why. That kind of documentation has the potential to produce a less-agile administrator who doesn't know the right questions to ask when given a request, doesn't know how the pieces fit together to alter instructions or his or her own customized configuration, and can't troubleshoot problems when things go wrong.
In some chapters, all the author really did was summarize existing documentation from Oracle's support site. But because so many details are omitted, the summary is actually more confusing than the documentation itself. Taken on its own, this would likely result in more questions and more service calls than the opposite.
To be fair, the book is not factually inaccurate -- despite the fact that the title of the book misspells the name of the product suite ("Oracle Identity Manager" and "Oracle Access Manager" are two separate products; while the suite is called "Oracle Identity and Access Management") -- but neither is it particularly helpful. The only audience likely to find value in this book is IT managers who need a very rudimentary understanding of Oracle's identity and access management architecture, so they can decide whether to buy it and what they'll need to implement it, BUT don't intend to use the book to actually follow instructions for implementation. Even though there is virtually no original material, it does at least collapse a subset of material spanning a handful of manuals into one place. But the reader is likely going to need to supplement with Oracle documentation anyway, so it's not clear this benefit is worth the cost of the book.