Five Whys and its sister Five Hows is a brainstorming tool that drives you to the reasons behind something happening when it is not obvious (5 Whys problem solving) or a desired outcome (5 Hows strategy).
Yellow Belt article
Five Whys and its sister Five Hows is a brainstorming tool that drives you to the reasons behind something happening when it is not obvious (5 Whys problem solving) or a desired outcome (5 Hows strategy).
Yellow Belt article