I would say Kinsey Millhone, Sue Grafton's character from her alphabet series. I always liked the way Kinsey wrote notes on index cards when she was working on a case, in order to keep her facts straight. I have taken this idea and I use it for my character's information, setting, etc. It helps me to make sure that I don't change something later on and my reader wonders why I changed something. I use it to keep sort of a timeline. If I use a source, say a medical professional, as in my story about my grandmother, I put those facts and contact information on the card. I could go on, but hopefully you got the idea.