I'm a multi-tasker. I was down with that stuff before they invented the term.
I like multi-tasking.
I like people trying to do two things at once.
My reading life is like an airport where a bunch of planes circle in a holding pattern, then - boom, boom, boom - several come in for a landing.
I think humanity can do more than one thing at the same time.
I've done that quite often, but I've got to be quite honest... as much as you would want to only do one at a time, sometimes projects overlap and there's nothing you can do. Sometimes you to have begin writing a new project just as you're finishing off another.
Good Lord - if I couldn't multitask, I don't know what I'd do.
I can write two scripts concurrently, but I usually prefer to do one at a time. However, I also usually have 5 or 6 story ideas that are percolating in my head at any one time, so it can get a little crowded in there.
I believe that one can indeed work on two or more tasks at once, but in ways yet to be understood.
I'm very aware of what you're talking about as I was involved with the radio in Africa in the same period as I was doing Concrete - I was doing both at the same time.