I'm all for working on multiple projects, but there should be a MAIN project that takes up about 80% of your drive and energy.
Writing multiple stories isn't all that hard IMO. Writing multiple PUBLISHABLE stories is.
IMO, it takes a certain type and amount of energy to polish that story until it is gleaming. For me, there is a part in the process, around the 4th re-write/editing job, where i'm about out of energy and love for this story. During this phase, if I were to work on something else, I doubt i'd ever return to the story. I find that 'focus' is essential when I get to this stage, to push the story over that last hump from a 'good' story to a 'publishable' story.
Not to say I don't put something in a drawer for a week or two to clear my head and revisit it. I'm a firm believer in doing that as you get towards the end because if I stare at it too long, I can't see the forest for the trees.
anyways, i'm babbling.
I think its o.k. to write general thoughts and outlines related to another book. And even on occasion brainstorm and write out some first draft stuff for the other book. but all of that should happen on the side while your MAIN focus is the WIP book.
In short, there is a reason why a wheel is round.
There is a reason why most writers work on one book at a time.
Mel...