The aim of the book is to give an introduction to the method of Q Spectral Sum Rules and to review its developments. After some general introductory remarks, Chiral Symmetry, the Historical Developments of the Sum Rules and the necessary materials for perturbative Q including the MS regularization and renormalization schemes are discussed. The book also gives a critical review and some improvements of the wide uses of the QSSR in Hadron Physics and QSSR beyond the Standard Hadron Phenomenology. The author has participated actively in this field since 1978 just before the expanding success of the SVZ QSSR.Contents:Chiral Symmetry — Spectral Sum Rules — MS Scheme and Perturbative QA Mini-Review of Some Non-Perturbative Aspects of QSVZ Expansion: Theoretical FoundationsMethods for the Evaluation of the Wilson Coefficients of the Condensatesρ Meson Spectral Sum Rules and the Determination of the Vacuum CondensatesWeinberg and Axial-Vector Sum Rules in QSU(2) Chiral and Flavour Symmetry Breakings: (Pseudo) Scalar and ω-ρ Mixing Sum RulesThe “Strange” Strange Quark: SU(3) Breakings from the Light-Meson SystemsHeavy-Quark SystemsHeavy-Light Quark SystemsBaryon SystemsGluonia Sum Rules and Low-Energy TheoremsExotics: Hybrids or Hermaphrodite Mesons and Four Quark StatesVertex Sum Rules, Form Factors and Wave FunctionsWeak Decays — CP ViolationDetermination of Λ to Four Loops and Q Formulation of the Tau (τ) DecayFurther Uses of the Spectral Sum Rules in QQHD Spectral Sum Rules for Some Composite Models of Electroweak InteractionsAppendixReadership: Particle physicists.Key Features:A joint publication with the American Society of Agronomy to further international awareness and cooperation with the scientific community and beyondTo inform, spur, and integrate the work of leading researchers in the major regions of the world