Do you have trouble saying “No” when you’re asking to do something? If so, you probably find yourself too busy for your own good--or anyone else’s. Mary Byers gives us an idea that will help. The technique is called, “Five Times Why,” and it’s attributed to Taiichi Ohno, father of the Toyota Production System. Here’s how it works. When someone asks you to do something and you’re feeling overwhelmed, first ask yourself--