Absolutely - that sounds like it would be a good approach. The main point I'm trying to make is that (at least, in my experience) there at least two classes of

Absolutely - that sounds like it would be a good approach. The main point I'm trying to make is that (at least, in my experience) there at least two classes of "guitar-related information," one that's amenable to rote memorization - like the notes on the fretboard, music theory "facts", etc - and another category where the information sticks better and in a much more usable way if it's learned in context. I would think that "ear training" (specifically interval identification) would probably be somewhere in the middle - you could benefit simultaneously from the "rote" memorization and also apply it on the fretboard). I spent a long time just playing the different 3nps shapes and never had them really soak in until I started picking small chunks of them out as useful during improvisation and really focusing on them while playing over loops or just noodling. What would be really awesome, especially if you're improvisation focused, would be some cards that have a short backing section attached to them - so that you can hear some musical context and then work on some small chunk of information (like 2 or 3 strings of a scale). Something like that would probably the best of both worlds and I bet you could learn a lot of material really quickly that way.