To succeed, entrepreneurs need a good idea, timing, money, luck. But more than anything, they need grit. Don’t confuse grit with sheer persistence; it’s not about charging up the same hill, again and again. The sort of grit you need to scale a business is less reliant on brute force. It’s actually one part determination and one part ingenuity — the ability to generate an endless supply of Plans B. And Nancy Lublin has a boundless supply of grit, which fueled her success scaling three successful not-for-profits: Dress for Success, DoSomething.org and Crisis Text Line. With practical wisdom and wicked humor, she shares the innovative approach to technology, financing, volunteers and staff development that have given her organizations such scale. If you think the for-profit world has a monopoly on scale thinking, think again.