I. BEFORE CONTRACT AWARD
a. Mandatory:
1. Central Contractor Registration
2. Excluded Parties List System (EPLS)
3. Open Ratings, Inc. (PPE)
4. Data Universal Numbering System (DUNS)
5. Online Representations and Certifications Application (ORCA)
b. Optional:
II. AFTER CONTRACT AWARD
1. Vendor Support Center (VSC)
1. GSA QUICKLINKS
2. GSA SITE MAP
3. GSA SCHEDULE SOLICITATIONS
4. GSA ORGANIZATIONAL CHART
5. GSA SCHEDULES E-LIBRARY
6. GSA ADVANTAGE
7. GSA E-BUY
8. GSA E-OFFER/MOD
9. GSA E-RESOLVE
10. GSA SCHEDULE SALES QUERY
11. FEDERAL BUSINESS OPPORTUNITIES
12. FEDERAL PROCUREMENT DATA SYSTEM
13. GSA OFFICE OF SMALL BUSINESS UTILIZATION
14. SBA OFFICE OF SMALL BUSINESS UTILIZATION
15. SBA SUBCONTRACTING DIRECTORY
16. MARKETING TO THE FEDERAL GOVERNMENT 17. GSA ACQUISITION MANUAL (GSAM) 18. FOR BUSINESSES WORKING WITH GSA (VENDORS) 19. FEDERAL ACQUISITION REGULATIONS