How does the Bottom Up approach function in BES Cyber Asset identification?

The Bottom Up approach in Bulk Electric System (BES) Cyber Asset identification is primarily characterized by its reliance on a comprehensive and detailed inventory of cyber assets across the entire organization. This method emphasizes the importance of having a complete wall-to-wall Cyber Asset Inventory, which ensures that all applicable assets are accounted for and analyzed in the context of their potential cyber vulnerabilities and risks.

By starting at the granular level and building up to a holistic view of the system, this approach captures a full picture of the cyber landscape. It takes into consideration not just major systems but also the interconnected components that may impact cyber security. This thorough inventory process is crucial for effective risk management, as it helps to identify and prioritize the assets that are critical to the reliable operation of the Bulk Electric System.

Focusing solely on physical asset inspections, while important, does not encompass the full range of cyber assets necessary for a comprehensive understanding of cyber vulnerabilities. Relying solely on community feedback or expert opinion lacks the systematic rigor provided by a complete inventory, potentially leading to gaps in identification. Therefore, having a detailed Cyber Asset Inventory is central to the Bottom Up approach, ensuring no critical assets are overlooked in the identification process.