The first edition of this book was written on a typewriter; we delivered a typed manuscript to the publisher. We wrote the second edition on computers and delivered a printed manuscript. This edition was written on computers and e-mailed to our editor—no manuscript, not even disks. That illustrates one of the changes in the way people communicate that propelled us to undertake a thorough revision. E-mail has become so ubiquitous that we added a chapter and revised several others to take full account of its influence. Another change in recent years is the fading of the internal memo — displaced in many uses by e-mail, in others.
