This book is intended for an introductory digital design course for students at the freshman level; it is also intended for an introductory computer design course with assembly language programming for students at the sophomore level or above. The material in the book is suitable for students who study computer engineering, computer science, and electrical engineering. This book uses a spiral teaching approach by introducing a design problem and then, in the same or later chapter, either (1) reemphasizing the same concepts when a different design problem is presented, or (2) working the same problem using a different technique. This is done to increase the likelihood of retention. There is no prerequisite for the book; however, computer familiarity and/or a first programming course usually helps students to learn VHDL and assembly language programming.