A3

A3 problem solving is a structured problem-solving and continuous-improvement approach, first employed at Toyota and typically used by lean manufacturing practitioners.[1] It provides a simple and strict procedure that guides problem solving by workers. The approach typically uses a single sheet (one-pager) of ISO A3-size (~11x17in) paper, which is the source of its name. More contemporary versions include the Systems-oriented A3 (or S-A3). https://en.wikipedia.org/wiki/A3_problem_solving