A3 Problem Solving is a continuous improvement approach developed by Toyota. Apart from problem solving, Toyota also uses it for business proposals and tracking status of various objectives. A3 refers to the standard paper size (11 inch by 17 inch) and all relevant details are summarized in this one sheet.
An application-oriented question on the topic along with responses can be seen below. The best answer was provided by Premkumar T on 17th Nov 2020.
Applause for all the respondents - Glory Gerald, Premkumar T, Sanat Kumar.