Things Are Different Here

Source: Table 4-1 SP800-82

The AIC and the CIA
C - Confidentiality

I - Integrity

A - Availablility

Conventional I.T. focuses on CIA, in that order. Confidentiality is paramount. With ICS, availability is the number one objective, always. Some machines don't get patched. Some don't get antivirus. Some are never rebooted.