This industry group comprises establishments primarily engaged in providing expertise in the field of information technologies through one or more of the following activities:

(1) writing, modifying, testing, and supporting software to meet the needs of a particular customer;

(2) planning and designing computer systems that integrate computer hardware, software, and communication technologies;

(3) on-site management and operation of clients’ computer systems and/or data processing facilities; and

(4) other professional and technical computer-related advice and services