Many Human Performance tools have been developed since the field gained popularity. While details surrounding the development of any Human Performance tool is often lost to history, they were probably born of necessity. System operators are encouraged, and sometimes mandated, to use Human Performance tools to reduce errors. Many entities implement Human Performance training and embed Human Performance tools and processes into plans and procedures. The Advanced Human Performance for System Operators training course is an extended review of the human condition. It addresses several NERC Lessons Learned examples. These examples are discussed as scenarios to address potential problems, contributing factors, and tools available to help correct issues. This online course is part of the System Operations training series.