Dear Readers, Thanks for making it #1 Best seller on Amazon!Thrilled by responses, driven by suggestions, here is second edition of the book to add: -Analysis of real life Industrial application collected from multiple MNCs-Question bank (100 fundamental based and 50 numerical based questions)-Editing based on feedback received, to bring more valuePurpose of the book: -This book is to take you through an exciting journey of learning new mechanical engineering language, namely, Geometric Dimensioning and Tolerancing (GD&T). It is a functional language to define and communicate geometric tolerances (allowable variations) applicable to geometries (also called features) of mechanical parts and assemblies. -The purpose of this book is to learn (read and write) this language.What can the reader hope to learn by reading the book?Starting the journey with the origin of GD&T, we will learn: -Fundamentals of dimensioning, tolerancing and dimensioning rules.-Fundamental concepts of hole and shaft basis systems, basic/nominal size, limit, tolerance, actual size, deviation, allowance, and related technical terms.-Understanding mechanical features, a feature of size (FOS) and feature material condition (MMC/LMC/RFS), Datum, Datum feature, Datum feature frame, the degree of freedom, datum target, and datum simulators.-Fourteen feature controls tolerances of GD&T (straightness, flatness, circularity, cylindricity, etc.), practical application of each tolerance, the impact of MMC/LMC, understanding bonus tolerance, and writing in feature control frame.-Advanced concepts of boundary and envelope, MMB, LMB, RFB, virtual condition, resultant condition, unrelated and related actual mating envelopes.-14 most frequently used modifiers, namely, translation, projected tolerance zone, free state, tangent plane, unequally disposed profile, independency, statistical tolerance, continuous feature, controlled radius, dimension origin, between, all around, all over, and individually.-Analysis of industrial application examples, to see how industry adapts and modify the standards in real life.-100 fundamental based and 50 numerical questions to test your learning..-Appendix section including the concept of ISO-286 and IT grades, industry best practices for dimensional tolerancingWhile covering more than core GD&T concepts, a couple of designing process have also been included to provide holistic knowledge for practical purposes.About the journey of writing this book: Being a mechanic