[...]This manual was created with the aim of self-teaching of GIS using ArcGIS 9x software. It is obvious, therefore, that the content of the book refers to all versions of ArcGIS 9x. Of course, ESRI, following its usual practice, will modify this software as it progresses to newer versions (9.1, 9.2, etc.). The authors closely monitor these developments and the small changes that will arise will be incorporated into the book as "Appendix" for each new edition. You can find these appendices at the node http://geography.survey.ntua.gr, so that, if you have any version of the ArcGIS 9x series software, you can use this manual.[...]
(from the book's preface)