Courtesy of @rands on Twitter:

In a previous blog post we summed up multitasking as:

Multitasking is the ability to shift between tasks very quickly. Also known as timeslicing, these transitions happen so quickly it appears like multitasking. However, each time you switch between tasks you must back up just a bit and review where you left off to make sure you don’t miss any critical information, essentially doing the same work over and over. The constant starting and stopping of tasks leads to “mental friction” and increased stress.

Focus on one task until it is complete. You’ll be transformed to a  focused, productive and less stressed person!