This document discusses creating a culture of operational discipline. It defines operational discipline as doing the right thing, the right way, every time. The core values that define this culture are: level of knowledge, formality, questioning attitude, forceful watch team backup, and integrity. It uses the Deepwater Horizon oil spill as a case study to show how robust processes alone are not enough - a culture embracing these values is also needed. While the BP leaders on the rig followed expected processes like safety tours, they did not demonstrate the core values. For example, they did not have an adequate level of knowledge, ask questions when they noticed issues, or hold others accountable. This highlights the importance of these cultural values for operational excellence.