I occasionally try multiple journals and it keeps getting all confused. I like the idea of having a journal just for one topic, but stuff happens. I get tired of writing on a particular subject but there is lots of book left and I do not want to waste it so....I repurpose it for another topic.........sometimes this happens more than once to the same book.
I suppose keeping a journal on the computer would be more practicle and easier to organize, but paper has a strong appeal for me that is hard to explain.