"This well-organized book covers the GTL from basic concepts to advanced topics, and it's a great companion to the SAS Graph Template Language User's Guide document. The author explains the thinking and design very clearly and in great detail. Whether you've been a statistical analyst for years or you just started programming in SAS, you can learn a great deal from this book. The program examples in the book can be copied and applied directly to your daily job. I'd recommend this book to anyone who wants to learn and use this powerful tool from SAS."