It's your ability to focus-and remain focused-on a task.
Can you clear out the clutter of:
- email lists you don't read anymore
- not answering the phone when you're in the middle of another task (unless it's your spouse!)
- NOT multi-tasking. Yes, I'm serious
Remove the distractions. Stay focused. Get the job done.
The more I think about this, the more it sounds familiar...some of these themes were echoed in The Millionaire Mind.