Don’t forget multi-taksing’s little brother: interruption.
“I’ve just got a quick question you…” Yup, your 12 second question costs me 15 minutes. Each and every time. Sprinkle a few “quick questions” around and I will be as productive as if I played video games the whole time. N
One task. No interruptions. Even then its hard to keep all those little brain cells on target.