Final answer:
To protect against ESD when working on computer systems, one should use an ESD wrist strap and an antistatic mat to ground oneself and provide a safe surface for components.
Step-by-step explanation:
Two procedures that can help protect against ESD (Electrostatic Discharge) when working on a computer system include using an ESD wrist strap and an antistatic mat. The ESD wrist strap grounds your body to prevent a build-up of static electricity that can damage sensitive components. An antistatic mat is also used to provide a safe surface for your electronic components; components placed on this mat are less likely to be damaged by ESD.