1. The floppy disk containing the four DOS programs is replaced by a CD containing a Windows program called KENPAVE, which combines the original KENLAYER, LAYERINP, KENSLABS, and
   SLABSINP into a single package, together with the addition of some computer graphics. The software was written in Microsoft Visual Basic 6.0 and can be run on any computer with Windows 95 or higher.
2. Section 13.5 on the AASHTO method of overlay design has been totally revised. The 1986 AASHTO Design Guide was used in the first edition. The guide was revised in 1993 with practically no change
   in the design of new pavements, but the design of overlay was completely rewritten.
3. New developments and information from the literature have been added to keep the book current. A new method based on the Mohr-Coulomb failure criterion has been added in KENLAYER for
   nonlinear analysis, and new comparisons age made between KENLAYER and the latest Windows version of MICH-PAVE.
4. Three new appendices have been added: Appendix D—An Introduction to Superpave; Appendix E—Pavement Management Systems; and Appendix F—A Preview of 2002 Design Guide.
   Appendix C is combined with Appendix B; a new Appendix C contains a brief description of KENPAVE.
5. To provide room for the above additions, Sections 3.4.3 (on contained rock asphalt mats) and 10.5 (on probabilistic computer programs) have been deleted.

YANG H. HUANG, Sc. D., P E.
Professor Emeritus of Civil Engineering
University of Kentucky