The value of doing one thing at a time

Lately, I’ve been at a loss in this respect, but I found this HBR article to be very helpful:

The Magic of Doing One Thing At a Time

The author’s point:

when you switch away from a primary task to do something else, you’re increasing the time it takes to finish that task by an average of 25 per cent.

But most insidiously, it’s because if you’re always doing something, you’re relentlessly burning down your available reservoir of energy over the course of every day, so you have less available with every passing hour….

When you’re engaged at work, fully engage, for defined periods of time. When you’re renewing, truly renew.

I’m hoping to be able to get back into this type of mode.