Quarks and Leptons From Orbifolded Superstring This book is a guide for all those who want to explore the standard model using string theory. The approach pursued is “halfway” between a textbook and advanced research work and accordingly the book will allow both graduate students and particle phenomenologists to easily get acquainted with this fascinating field. In this new edition the authors report on the status quo of the standard model following the discovery of the Higgs Boson as well as the latest results concerning physics beyond the standard model. They present a formal introduction to string orbifolds and explain in detail how the massless states and the Kaluza Klein spectra can be derived from the partition function. In turn they provide an overview of orbifold phenomenology by introducing the key aspects of string orbifolds in the context of SUSY standard models. In closing the authors discuss the Grand Unified Theories (GUTs) from orbifolds and share key concepts regarding Calabi Yau compactifications M theory and F theory. Introduction and Summary Standard Model and Beyond Orbifolds Spinors Field Theoretic Orbifolds Quantization of Strings Strings on Orbifolds Formal Construction Non prime Orbifolds Interactions on Orbifolds Effective Action Algebraic Structure Orbifold Phenomenology String Unification Smooth Compactification Flavor Physics Other Constructions A. Useful Tables for Model Building.