This book is small and great. I learned a great deal from this book, about grammar, spelling, punctuation, and capitalization, among other things. This book, if studied and mastered, greatly improves one's techical writing technique.
The section on English as a second language leaves a bit to be desired, but I suppose it is understandable, since this book was written for native English speakers. Good book.

William Pfeiffer's book serves as a solid introduction to the technical writing process, and then retains value as a practical reference tool. The book showcases plenty of writing samples, and touches on some of the more common grammar problems encountered in the writing process. While not the definitive guide on writing (is there such a thing?), the "Pocket Guide to Technical Writing" is a worthy addition to the technical writer's library.