The Anesthesia Quality Institute was founded to create and maintain the National Anesthesia Clinical Outcomes Registry (NACOR). This project is now two and a half years old and more than 135 practices, including nine ABC clients, have contributed more than 5 million records to this “every case, every day” registry. Participants have online access to the NACOR Reporting Server, where they can see continually updated summaries of their practice performance and aggregated national benchmarks. This information, and the ability to slice and dice it to examine subsets of interest, is an important business and quality management tool. After all, what can’t be measured can’t be improved.Or can it? Although we pride ourselves on our data-driven, scientific, high-tech practice, anesthesiology remains as much art as science. As the popularity of morbidity and mortality conferences attests, there is a lot to be learned from the unfortunate experience of others. Schadenfreude aside, detailed discussion...