This chapter activates T11 (Feedback Loops) at the infrastructure level. In Book 1, Chapter 35, feedback loops controlled iterative algorithms. In Book 2, Chapter 19, measurement and adjustment were the basis of benchmarking. A load balancer with health checks is a feedback loop: measure server health → adjust routing → measure again. The chapter also continues T8 (Divide and Conquer): distributing load across N servers is the infrastructure form of dividing a problem into N independent subproblems. In Book 4, the load balancer appears as a standard component in every distributed system design.