This text presents the essentials of modern logic design. The author conveys key concepts in a clear, informal manner, demonstrating theory through numerous examples to establish a theoretical basis for practical applications. All major topics, including PLD-based digital design, are covered, and detailed coverage of digital logic circuit testing methods critical to successful chip manufacturing, are included. The industry standard PLD programming language ABEL is fully integrated where appropriate. The work also includes coverage of test generation techniques and design methods for testability, a complete discussion of PLD (Programmable Logic Device) based digital design, and coverage of state assignment and minimization explained using computer aided techniques.