I used this book as a primary text for inspection training, and it does an adequate job of explaining the information. However, it does not quite explain the material as well as some of the other books on the market. Now, if this is your primary text for GD&T application from a design standpoint, immediately file this one in the nearest garbage can and consider: Dimensioning & Tolerancing Handbook by Drake (probably the one to get if you only get one text because it is very comprehensive...even includes stack-up calculations), GD&T Fundamentals by Krulikowski, or Design Dimensioning and Tolerancing by Wilson (this one and the one by Drake are really done with the design application in mind). Bear in mind that the previous texts and the one under review all reference the 1994 revision of the standard (which should be fine because the vast majority of industry has largely ignored the 2009 revision...to date).