Some cards have ten or more galleries listed. This system, while primitive, is accessible even when there's a brush in the other hand. Hardly a week goes by without somebody phoning or writing to ask what I know about a painting in their collection. I'm so glad I have this resource. It makes for lifelong connections, positive feedback, ongoing support.
Some artists use a journal and place entries and comments in the order they do the work.
Others use popular systems such as Microsoft Office which permit date, title, or other priority. If one is so inclined it's possible to find out how many 12 x 16's were painted during a particular period, and what the batting average was. These days there are specific art management software such as Artsystems. If I had to do it again I would make it computer and photo-based. I'd take the time.