The document introduces the A3 problem-solving method using a single sheet of paper. It explains that A3 thinking structures how problems are captured, communicated, and addressed. The key components of an A3 report are the current condition, target condition, steps to address the problem, and measurements to track progress. The A3 method focuses on visible thinking to close knowledge gaps before performance gaps. It should be used as a learning tool following the PDCA cycle to pursue problems where the solution is not already known.