Splinter, but...
I use Picture Splinters. So, 3
♦ would show club support with two of the top three honors, a stiff diamond, and three of the top four of my major, no 1st/2nd control in the fourth suit.
Classic might be, after 1
♠-P-2
♣-P-3
♦, something like:
♠AQJxx
♥Qxx
♦x
♣KQxx
The stiff could be as high as a Queen, but no higher.
The fourth suit could have the Queen, but not higher.
My suit, or our suit, could be stronger.
Asking bids then kick in, skipping 3NT (to play) and three of my major (sets trumps back to the major), as follows (no "your suit" ask because that's now trumps), step responses:
First non-used step = asks about spades (my suit); 1: Missing the Ace, 2: missing the King, 3: issing the Queen, 4: missing the Jack, 5: solid AKQJ
Second non-used step = asks about the hearts (the unbid suit); 1: no Queen, 2: Queen
Third non-used step = asks about clubs (the agreed minor); answer in steps (1: HH, 2:HHJ, 3: HHH, 4: HHHJ
Responder picks which question he wants to first ask.
Opener, if he has the highest possible answer, also answers the next priority question (priority established by steps) if there is no room to ask two different questions below the next level of the agreed suit (clubs). He might also answer the third question is his second-question answer is also highest and the same result occurs.
If Responder instead sets the major as trumps, you either use normal cuebidding OR have Opener relay (3NT in the example) to allow asking bids by Responder with spades (the now-agreed major) as trumps.
In my thought, however, direct asking bids make more sense, pretending that the minor is agreed, when you as Responder really want to raise spades. To do this, however, you must always skip the major as an asking bid. Further, you may want to consider whether wrap-around answering should be used when the answer is maximal and there is no space for two questions below the next level of the minor OR the next level of the major. That gets trickier, but I think it works best in the long run.
For the timid, set the major.
I'm surprised that not everyone does this.
"Gibberish in, gibberish out. A trial judge, three sets of lawyers, and now three appellate judges cannot agree on what this law means. And we ask police officers, prosecutors, defense lawyers, and citizens to enforce or abide by it? The legislature continues to write unreadable statutes. Gibberish should not be enforced as law."
-P.J. Painter.