Unless you have a great memory, you will need to keep a writing diary/file of information to be used or to use again. It may be that you only write one story, and then perhaps you can get away with the occasional note. You might be able to write everything on little scraps of paper; however, if you intend to write more than one story in the same vein, then you need to have a record of the sorts of things that you may need accurate information about to maintain consistency.
When writing the Steele novels, I soon discovered that I needed to keep accurate records of the types of vehicles my hero liked to drive. Additionally, it was necessary to keep abreast of the latest developments in vehicular technology to keep my stories up-to-date. This type of preparation is necessary to keep your writing current.




