Glibly referred to by anyone with a smattering of data and telecommunications savvy, few have ever read it. As usual with breakthru authors, their efforts get commercially applied and the insightfulness of the original work is closeted, where it can conveniently be academically referred to "what he said was..." (ellipsis filled in by whatever your professor used to characterize the book.) Shannon took an early art form to a rigorous science. This is the book reporting the method of the since-evolved science of data communications, and a good bit more. The fact that I am the first reviewer in this forum speaks eloquently of the paucity of readers and the concomitant large number of data communication experts who have ignored the now larger issues it discloses than the single commercial application of one of its conclusions. Read it. You will agree with me that focusing on the source rather than the sink (terms he coined) is the weakness of communication theory as currently modeled on Shannon's first, obvious conclusion. The development of the digital computer over the past five decades has opened up the way to harness the ideas that lie latent in this excellent, groundbreaking book.
Harvey B. Vedder ret Sr Data Comm Eng, Bell Atlantic email@example.com