Digital Principals and Design is a comprehensive new textbook, which takes a classical approach to the subject of digital design, emphasizing through presentation of the basic principles of logic design and the illustration of these principles. The book is intended for an introductory course in digital principles with emphasis on logic, design as well as for a more advanced course. With the exception of the digital circuits appendix,it assumes no background on the part of the reader. Students in computer science, computer engineering and electrical can use the text.