The book commences with an overview of system software and briefly describes the evolution, design, and implementation of compilers. Detailed explanation of the various phases involved in the design of a compiler such as lexical analysis, syntax analysis, runtime storage organization, intermediate code generation, optimization of code, and final code generation is provided in various chapters of the book. The last chapter describes in brief all the frequently used compiler writing tools with examples and program codes. Written in a lucid manner, the book provides numerous examples, algorithms, pseudocodes and C codes in support of the text. Chapter-end exercises, appendices and the companion CD are provided to help readers revise and practice the learnt concepts.