I've suggested that what we call 'multi-tasking' is usually just switching between many activities at once - and often badly. It's what we might call 'consciousness interruptus'. A sample:
Damon Young thinks where media and communications are concerned, we're not made for multi-tasking.
"When we move from our job to an e-mail, it takes about a minute to recover our train of thought," he says. "And then we get another e-mail, or an SMS, so our concentration is fractured. The result? We're not really multi-tasking. We're switching between tasks in an unfocused or clumsy way."