North American Industry Classification System:
- 541330 Engineering Services
- 541511 Custom Computer Programming Services
- 541512 – Computer Systems Design Services
- 541513 Computer Facilities Management Services
- 541611 Admin and General Mgmt. Services
- 561110 Office Administrative Services
- 561210 Facilities Support Services
- 561320 Temporary Help Services
- 561330 Professional Employer Organizations
- 561612 Security Guards and Control Services
- 611710 Educational Support Services
- 561990 All Other Support Services
- 541990 All Other Prof, Scientific, and Tech Services