The basic principles in this book may or may not be valid. It's hard to tell, because most of the examples given are no longer valid. So much time is spent on IBM and computers in general, and we all know how much has changed in those areas in the last 8 years. The authors couldn't predict how things would go. They grossly underestimated the popularity of the PC and gave virtually no credit to Microsoft as a company that would be viable in the future. They touted Lotus 1-2-3 and were skeptical that "office suites" would ever catch on. (Microsoft Office, anyone?). I think the book is interesting from a historical perspective, but could be dangerous to apply to business today.