This text was designed for a graduate level course on computer architecture and organization. The book's content, especially the last half of the book, represents the most advanced material that a typical graduate student studies before directly encountering the design process. The text avoids extensive compendiums of current features of various processors or technologies, just as it stresses concepts that underlie these processor designs. It abstracts the essential elements of processor design and emphasizes a design methodology including: design concepts, design target data, and evaluation tools, especially those using basic probability theory and simple queuing theory.