I read several other books in the Understanding Language Series for my major in Linguistics, but this one seems more dense than the others. I found the examples provided weren't explained very well. Rather, they were just given and the reader is allowed to make of it what they will. A standard format for this book is to give a term, a vague definition, and then an example with no explanation of how the term is exemplified by the example. Sometimes it can be obvious, but large sections of the book seem to just be almost like a glossary of terms without really describing how they fit into the larger field of SLA. Along with those terms, the author often just lists papers that would show whatever point is supposed to be being made, but the problem is that there is no discussion of even what is the content of the papers, which makes it ineffective. Without the ability to go immediately find and read those journal articles, there's no point really being made. While the other books in this series are decent texts that can be mostly understood even without the guidance of a class, instructor, or supplemental readings, this one needs external resources to get the most out of it. I'm still interested in SLA, but I don't feel like I've learned as much as I'd hoped from this.