What if you could combine the agility, adaptability, and cohesion of a small team with the power and resources of a giant organization? The old rules no longer apply. When General Stanley McChrystal took command of the Joint Special Operations Task Force in 2004, he quickly realized that conventional military tactics were failing. Al Qaeda in Iraq was a decentralized network that could move quickly, strike ruthlessly, then seemingly vanish into the local population. The allied forces had a huge advantage in numbers, equipment, and training, but none of that seemed to matter. Teaching a leviathan to improvise is essential. It's no secret that in any field, small teams have many advantages—they can respond quickly, communicate freely, and make decisions without layers of bureaucracy. However, organizations taking on really big challenges can't fit in a garage. They need management practices that can scale.