How does CIP-004 R5.3 address access to BES Cyber System Information upon termination?

CIP-004 R5.3 establishes a specific timeline for revoking access to Bulk Electric System (BES) Cyber System Information when an individual's employment or relevant status is terminated. The requirement states that access must be revoked by the end of the next calendar day following termination. This is crucial for maintaining the security and integrity of sensitive cyber systems, as it minimizes the risk of unauthorized access that could result from delayed revocation. By ensuring that access is promptly terminated within this timeframe, organizations can better protect their critical infrastructure from potential threats posed by former employees or contractors. This aligns with the overall goals of the NERC CIP standards, which emphasize stringent access control and prompt action in response to personnel changes.