My favorite technique is to use different colors to write in to represent different parts or groups in the system. (I know handwriting can tell a lot, but so can the colors a part chooses to write with.) We’ve used colored pens and thin tipped markers…..some of the kids like to use crayons.
Keep your journal out and easily accessible so that those you may be amnesiac to will be able to pick it up and write in it, too.
When you need to know something, ask someone inside by writing the question in your journal and leaving it open for others to answer. (this can work for parts you are amnesiac with)