So now that the details and advantages have been outlined, the following is a basic list of some student loans that are eligible to be consolidated: PERK - Federal Perkins Loans, formerly Nations Defense/National Direct Student Loans (NDSL), PLUS - Federal PLUS (Parent) Loans, SCON - Subsidized Federal Consolidation Loans, UCON- Unsubsidized Federal Consolidation Loans, SLS - Federal Supplemental Loans for Students (formerly Auxiliary Loans to Assist Students (ALAS) and Student PLUS Loans), SS - Subsidized Federal Stafford Loans & Guaranteed Student Loans (GSL), DSS - Direct Subsidized Stafford Loans, DUS - Direct Unsubsidized Stafford Loans, DPLUS - Direct PLUS Loans, DUCON - Direct Unsubsidized Consolidation Loan, including Direct PLUS Consolidation Loans.