pp. Performing one task at a time.
2005
What's wrong with monotasking? As a veteran of this activity, let me say that to soldier on in dogged pursuit of one thing-and one thing only-is a joy. Is it sexy? No, but it is effective.
2004
I juggle very badly, and the thought of a life of endless multi-tasking makes me want to crawl under the duvet cover and cry. I am only good at mono-tasking: that is, concentrating on one thing to the exclusion of everything else, like a small boy with a Lego set.
1998 (earliest)
Back in the lazy mono-tasking days, even if you were a multi-tasker, you didn't like to admit it. Multi-tasking seemed a failure of focus. It seemed impolite.
The word monotasking has been around in computing circles since at least the early 1990s and is most often used to refer to an operating system that allows the user to run only one program at a time.