A3 problem solving is a structured approach to resolving problems. It was popularized by Toyota, but is now in widespread use.
A3 problem solving is hard to replicate because it requires discipline to use it and persistence to go through the iterative steps of coming up with a resolution.
A3 problem solving uses the A3 report to keep people on the same 11 x 17 inch page.
A3 problem solving is similar in concept to the DMAIC process of Six Sigma. Both use a structured approach that makes the user thoroughly define and understand the issue, address it with improvement, and manage the corrections.