Research shows that multitasking is really inefficient. Trying to focus on and hop between multiple tasks dilutes focus, introduces delays, and makes things take longer to complete. Single Tasking Day, then, is about embracing one and only one task. Make a list, put it in order of priority, and get started on a task – and ignore everything else until you finish it!
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All details taken directly from provider content at http://www.daysoftheyear.com/days/single-tasking-day/