Well, mnemonics work quite well in medicine. As for the Socratic or dialectical systems you asked about—those are more complex to learn. I use them myself, but they took me some time to grasp. Ramon Llull and Bruno wrote about this; however, as I mentioned earlier, Bruno can be difficult to understand because he wrote for the scholars of his time. It’s not that his systems are inherently obscure, but rather that one needs to understand the logic and mnemonic systems of that era (since he adapted many existing systems to fit Ramon Llull’s universal system).
That is why I spoke of systems you can apply immediately—like analogies, which work instantly. If you have an alphabetical list of characters, it works very well; the characters need to be well-known so you can quickly create dramatizations involving them.
You can also use the method of loci, keywords (or words that sound similar), visual acronyms, and so on—these are the quickest to implement. The Socratic or dialectical method, however, is not simple at the start because it deals with logic. I won’t explain that system here; I’d end up writing a whole book on the subject, and it would generate a flood of questions. If you want to learn it, I’ve already mentioned the authors—like Bruno—but keep in mind that he assumes you are already familiar with Aristotle’s Organon, other logical systems, and the mnemonic systems of that period.