One idea can produce two ideas, but they both take a different slant, that’s the difference. For example, take this premise, as comedy for a Hollywood blockbuster that would get one star from the critics, depending on how well it was done, the potential to be a bomb.
A man spent ten years of his life around a lot of people and got so sick of them that he decided to isolate himself from people because he enjoyed the other half of his personality better and settles down with him, but his friend tries to get him back into socializing with people and to see the good side of humanity. In the end, he comes around to see the good side. That’s a silly comedy. But I can change the ending and the whole tone of the idea to sound like an arty drama. In the end the person stays away from people for the rest of his life and there is no seeing the good side. That’s a German drama. I would write neither.
There’s an easy way to file away ideas and thoughts. It’s not by filing ideas and thoughts for different genres into different notebooks, but simply keeping a notebook for everything that comes to mind. I’d been doing that way, but realized the put everything in one place approach is better. I’ve been keeping my Bible reading notes in one exercise book. This was for the purpose of jotting the ideas I get from reading the Bible which could become devotions, meditations and reflections. When other ideas came to mind, say a story idea that jumped into my head, I had to find a different notebook, or piece of paper, to jot the idea down. But it would be quicker just writing the idea in my devotional notebook because that was handy. I don’t like mixing various ideas around in a notebook intended for one thing, though. It makes much better sense to include everything in one notebook, doesn’t it? So, all one has to do is headline each notebook entry for what kind of idea it is: be it devotional, story, article, poem, etc.
And if one is the run, one may keep a recorder, or something like it, for easy recording when ideas come to mind. Keep the ideas in one place on the recorder and indicate what each idea is, whether story, article, poem, etc. Much better. All in one place and headlined for easy reference. All one needs now is a good notebook and/or a digital recorder. Digital recorders hold more information so spending on one is probably cheaper in the long run than buying notebook after notebook. May be just invest in a simple digital recorder for note-taking, if one likes, if that’s easier when on the run. Or write it down, if that’s preferable.