The previous three chapters (VIII, IX, and X) discussed how to use the SAS system to conduct ACA using the factor, cluster, and multi-dimensional scaling procedures. This chapter briefly introduces the use of SPSS version 15.0 to conduct ACA analysis. The SPSS accepts data files in many different formats including spreadsheets, database files, and tab-delimited and other types of ASCII text files. Assuming that cocitation frequency counts are stored in a spreadsheet file in Excel form, this chapter starts with how to import the data file in Excel format.