2. Focus on one task at a time

Psychiatrist Edward M. Hallowell describes multitasking as a “mythical activity in which people believe they can perform two or more tasks simultaneously as effectively as one.” 

When people attempt to apply themselves to too many tasks at a time, they are usually unsuccessful....

Constant interruptions and unnecessary distractions dilute your focus:

• Arrange your work space to discourage unscheduled visits.
• Plug in your earphones and listen to soothing music or white noise.
• Move to a quieter place if you can’t block out office banter.
...

When you're really struggling to get anything done, you should try this method, even if temporarily.

When you look at your task list, pick a single thing to focus on that day. It could be one big task you really want to get done, or it could be a theme that relates to several of your tasks....