Have you used them, and how well have they worked for you?

A couple of the techniques are:

* Mix things up. Doing "learning" in an all of one thing, then all of another, is less helpful than mixing up topics. Baseball players that practice hitting 20 fastballs, then 20 sliders, etc. do less well OVERALL than one where the pitcher randomly picks a type of pitch one after another.

* Learn in different ways, or using different answers. If you're learning to sight read music, read the measures backwards. Or down one side and up the other. When you're memorizing words, come up with a different sentence to use the word in, each time. Come up with a word that rhymes with the correct word. Describe a picture that would characterize the word/concept. Sing the word in a song.

* Synthesize, synthesize, synthesize. (overlapping the previous point) - when coming up with an answer to a question, consider different questions that have the same answer. What things are LIKE this answer? What things are different? Picture yourself using this word/concept in some setting. (Things I like to do are picturing myself in my house. Or outside. Or in the winter, or naked, or with a famous person (perhaps also naked).) The point is to create imagery associated with the thing you're learning.

A lot of this boils down to getting at the memory through many different neural pathways. SRS is just a way to strengthen ONE of those ways, which is important, but ideally you want to use many. One strong rope holding you from falling down a cliff is good. Many, possibly even weaker ones, can be much better.