I have a SAS program (multiple macros deep) that has: 1. Several input datasets with several thousands of fields, all being read in. 2. Few output flat files with hundreds of fields The issue is that the intermediate datasets are so large it is causing space issues and the performance is really bad. I want to identify only those fields on the input side that are essential, and use a keep statement. Besides manual tracing, is there any tool or method that I should use? We have sas (r) 9.1.3 on aix 5.3 I appreciate any guidance Biplob ... View more