Detailed installation instructions for ArcSDM2 are included in the documentation. Therefore, install the documentation first as follows: 1. Create a folder called ArcSDM in the arcgis folder that is commonly created on your C drive when you installed ArcGIS. The exact location of this ArcSDM folder is not critical, but it is useful at C:\arcgis. 2. Extract the documentation from the documentation zip file into a folder called Documentation in ArcSDM. If you are using something like WinZip, note the relative path for the Documentation folder is stored in the zip file; so simply extract into the ArcSDM folder. 3. To start the documentation, search for SDMhome.htm in the documentation folder and double click it. This should start your internet browser with the cover page for the ArcSDM documentation. Click on Table of Contents and read the following sections of the documentation before proceeding. a. Installation – This outlines the installation process for installation on an XP computer. Be sure that ArcGIS has all of the available service packs installed before trying to use ArcSDM. b. Before starting to work in ArcSDM, read "ArcSDM2 in ArcMap Overview" to gain an overview of what is different in ArcSDM from previous Arcview3 versions. There are many important differences in Spatial Analyst in ArcMap that required us to make major changes in ArcSDM. Note: During installation you may encounter a warning that the Setup wants to replace some file with an older version. Always answer that you want to keep your newer version.