Are you a plotter or a pantser?
I like to joke that all writing an outline tells me is the one way things aren't going to end.
Yes, I do research before and along the way. I take notes on that research and how it might relate to my story. Later in the first draft process, I sometimes write scene lists of what's coming up next and I occasionally write scenes coming up in the future as inspiration hits. I consider possible endings in my head, but I really have no idea for sure until get there.
Does this mean I have more changes to make in rewrites? Yes. Does this mean the rough draft might take longer to write than my outlining peers? Probably. Does it mean I sometimes get lost and stalled along the way? Most definitely. Will I ever change? Probably not...because...my imagination for plot seems to work best when I'm living in the story with my characters. Until I'm there, I have little to no idea what might happen...and what ideas I do get usually end up not being what will work best for my characters.
I've heard people say they outline once they're a third of the way into a book. I've never tried this before, but if I had to write an outline to sell a book as a partial, this is probably what I would do.
What about you? Plotter or Pantster?