541330          Engineering Services

541511          Custom Computer Programming Services

541512          Computer Systems Design Services

541519          Other Computer Related Services

541611          Administrative Mgmt. & General Mgmt. Consulting Services

541612          Human Resources Consulting Services

541618          Other Management Consulting Services

541690          Other Scientific and Technical Consulting Services

541712          Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)

541990          All Other Professional, Scientific, and Technical Services

561110          Office Administrative Services

561210          Facilities Support Services

561330          Employee Leasing Services

561410          Document Preparation Services

561421          Telephone Answering Services
561431          Private Mail Centers
561499          All Other Business Support Services

611420          Computer Training

611430          Professional and Management Development Training

611710          Educational Support Services