%26%26- According to Sandberg, %26mdash; a report on to-do lists and the people who make them and use them task lists arent the key to productivity that theyre cracked up to be. He reports an estimated 30% of listers spend more time managing their lists than they do completing whats on them. %26%26- This could be caused by procrastination by prolonging the planning activity. This is akin to analysis paralysis. As with any activity, theres a point of diminishing returns.%26%26