A3 Reports are one-page reports used for documenting the necessary information needed for progress reporting and decision-making.
A3 Reports simplify project reporting because they pull from otherwise numerous, detailed progress reports and extensive background analyses. A3s condense the information to a single page and visually communicate to the reader using graphs, charts, and succinct bullet points.
Also referred to as "one-pagers", the A3 Report got its name from Toyota Motor Company. "A3" refers to the metric paper size that the report is produced on (equivalent to a paper size of 11 inches x 17 inches).
MoreSteam Toolbox - A3 Report - http://www.moresteam.com/lean/a3-report.cfm