Having just recently graduated from college and currently working as a drilling rig supervisor, I found this text quite useful. It delves in some extent into EVERY aspect of drilling, from planning, casing design, interpreting drilling programs, mud properties, and trouble shooting. Anyone working in the drilling industry, particularly those in operations, will find this book useful. This book, however, is not really intended for absolute beginners. The text is worded and formatted on the assumption that you have drilling experience. This book is intended as a reference for drillers, rig supervisors, well planners, etc. In this regard, this book is very effective. I would definitely recommend it. The equations and calculations are not very detailed, and the explanations given to explain the calculations are not entirely adequate, but over all, it serves its purpose. This book will be frustrating for anyone not familiar with drilling operations. If this is the case, then you might want to check out "Drilling Technology in Non Technical Language", by the same author.