I critique the critiques, and revise my own process and recipes as necessary, and take notes on their notes. I type this stuff into my homebrewing software under the recipe for easy access in the future. Then the scoresheets are stuffed away into a file drawer. If I do a good job reviewing them right away, I shouldn't need to review them again later, but on rare occasion, I'll pull them out for one reason or another. But for the most part, you should be able to live and learn, and toss. It helps keeping a database or spreadsheet, that's the easiest. I lose paper, and it's bulky and "old-school". Yet I have eternal backups of all electronic data. So that's the way I prefer to keep important notes.