What are the differences between Cognos and SPSS modeler products?
The differences between Cognos and Modeler are very large.  Cognos is mainly a summary and reporting tool.  It does not do any statistical analysis to speak of (except when you use the part of SPSS Statistics that is optionally integrated into one of the Studios).  Modeler is a full data mining tool with many modeling capabilities.  Modeler can read and write Cognos data.