There are a couple of catches to writing like this. One is that you have to have a pretty good idea what events are happening in your story. If you don’t have a game plan this method of writing is likely to leave you with a huge mess of disjointed events. And by that I mean an even bigger mess than nonlinear writing gives you when you do have a plan, which is problem number two. When you do this, you’re invariably going to write a much later part of the story before what winds up leading up to it, and you’re going to have to then rewrite what you wrote before to make it match the lead up.