In the second revised edition of a well-established textbook the author strikes a balance between quantitative rigor & intuitive understanding using a lively informal style The first chapter provides a detailed historical introduction to the subject while subsequent chapters offer a quantitative presentation of the Standard Model A simplified introduction to the Feynman rules based on a toy model helps readers learn the calculational techniques without the complications of spin It is followed by accessible treatments of quantum electrodynamics the strong & weak interactions & gauge theories New chapters address neutrino oscillations & prospects for physics beyond the Standard Model The book contains a number of worked examples & many end-of-chapter problems A complete solution manual is available for instructors