This book is designed to be used with the SPSS Base 9.0 for Windows User's Guide. This guide to the statistical procedures in SPSS Base 9.0 contains several examples for each procedure, starting with default operations and moving on through the most commonly used optional specifications. It discusses the assumptions required by each procedure, checking the data for those assumptions, and finding strategies to deal with data that do not meet the required assumptions. The bulk of this guide focuses on the output, on understanding what the statistics mean and how the different statistics relate to each other. After reading this book, a user with limited statistical experience should have a much stronger ability to evaluate the different numbers that appear in the output and to understand the description they provide of the variable or relationship being analyzed.