Within the term "Industrial Security" there are several disciplines like Physical Security, Information Security, Investigations,OPSEC, and Computer Security. Which brings us to the  sub-specialties like Locksmithing, Background or Pre-employment Investigations, Interrogations, Security Education, Security Officers, Surveillance, CCTV monitors, Security Survey, Security & Life Safety Dispatchers and such. More often than not a person will serve in a multidisciplined position to minimize cost.