| North American Industry Classification System (NAICS) | Standard Industrial Classification (SIC) |
| 517110 – Wired Telecommunications Carriers | 4813 – TELEPHONE COMMUNICATIONS, EXC.RADIO |
| 541330 – Engineering Services | 7371 – COMPUTER PROGRAMMING SERVICES |
| 541511 – Custom Computer Programming Services | 7373 – COMPUTER INTEGRATED SYSTEMS DESIGN |
| 541512 – Computer Systems Design Services | 7379 – COMPUTER RELATED SERVICES, NEC |
| 541519 – Other Computer Related Services | 7389 – BUSINESS SERVICES, NEC |
| 541611 – Administrative Management and General Management Consulting Services | 8711 – ENGINEERING SERVICES |
| 541690 – Other Scientific and Technical Consulting Services | 8748 – BUSINESS CONSULTING, NEC |
| 541712 – Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) | |
