Many thanks both for your answers! I currently have everything by categories but it is becoming hard to manage and was looking into a new system - obviously the a-z system is the first I'm looking into since it's what is recommended in the GTD methodology. I believe that adding the note for paper documents could be extremely helpful! My main issue though is with digital since it's where I have most files, and would like to use the same structure for both. To give a couple of examples, both work related and personal: - Say that for work I have a validation report of a method to detect substance X in product Y through technique Z. The document could go in V (validation report), X (substance), Y (product) or Z (technique). Granted it's "just" 4 places, but considering the huge number of documents I have for each (validation reports, documents for the same substance, same product or same technique) it seems it would take quite a while to scan through all of them and find it. - For personal, an example could be the record for the last shot my eldest sone got. It could go under vaccines, medical records, name of my son, name of the medical center. In this case, vaccines seems to make most sense when focusing on nature of the document. However, a couple of years ago we had to change pediatricians. Since I have all the medical records together, it was fairly easy to pull them all out to make a copy for the new pediatrician. If I had an a-z system however, I would need to go through the whole system to find medical related documents per kid and make sure not to forget anything. I want to simplify the system, but I feel that a-z would complicate it even more and make it more difficult to retrieve things. I am clearly missing something, since it's the recommended method and seems to work for most people, but not sure what it is I'm missing!!!