This document discusses application resiliency planning and data center operations. It notes that application resiliency used to be simpler when enterprises had single architectures, but it is now more complex with applications distributed across multiple locations including colocation, edge sites, and the cloud. It also discusses common causes of outages including power, network issues, and facility problems. Finally, it recommends taking a comprehensive approach to data center facility management including automation, operations, quality management, availability, capacity planning, and governance.