People who think they're good at multitasking usually are the worst at it, research shows

People who think they're good at multitasking usually are the worst at it,
research shows.
The ability to multitask effectively might vary depending on personality
type and the ability to focus. Research has found that people who test high
for personality traits such as impulsiveness and risk-taking are often the
least effective at multitasking, but they also are the most likely to
multitask and to think they are good at it. Researchers believe this might
be because people who have impulsive personalities are easily distracted
and unable to focus on one task at a time, leading them to multitask.
People who are able to focus on the task at hand have been found to be the
most effective at multitasking, which researchers concluded was because
those people were not multitasking out of distraction but rather with the
intent to be more productive.

http://www.wisegeek.com/can-you-multitask-effectively.htm?m