# 4 - [WORK_ORGANIZATION] - The 5's why - How to find the roots causes issue…

The technique was developed by Sakichi Toyoda , founder of Toyota Industries Co., Ltd. . Originally used in automobile industry, the tool has seen widespread use beyond Toyota. Indeed the simplicity and the amazing efficiency of this method allow to identify and erase the root cause of any issue ,whatever the area. May this mindmpap be as useful to you as it is to me! What is the the principle? As its name implies, whenever you have an issue , "by repeating why five times, the nature of the problem as well as its solution becomes clear" according to Taiichi Ohno, the architect of the Toyota Production System.