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A3 problem-solving is a methodology to conduct root cause analysis. Specifically, A3 is the name of an 11 x 17 piece of paper, the international paper size. This document size is typically used to document the process, and where the name of the tool came from.
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Tracy O'Rourke

Tracy is a Master Black Belt at, the co-author of The Problem-Solver’s Toolkit and co-host of the Just-in-Time Cafe. She is also a Lean Six Sigma Green Belt Instructor at UC San Diego and teaches in San Diego State University’s Lean Enterprise Program. For almost 20 years, she has helped leading organizations like Washington State, Charles Schwab and GE build problem-solving muscles.