The level of complexity in most organizations today is staggering-and it's only getting worse. There are so many choices to be made, people to involve, processes to manage, and facts to analyze, it's impossible to get things done. And in today's hypercompetitive world, that can be fatal.

Yet complexity doesn't happen on its own. Managers unwittingly create it, often through well-intended decisions. In Simply Effective, Ron Ashkenas provides a playbook for regaining control, focused on the four major causes of complexity:

-Constant changes in organizational structures
-Proliferation...