https://blogs.fangraphs.com/torontos-hunter-mense-on-developing-good-swing-decisions/
Good read but i'll save you the click - cloes notes version is the Jays use a rating sytem to grade swing decisions. Mense is the assistant hitting coach.
Nice tidbit here:
Laurila: Can you give an example of a guy for whom that’s come pretty naturally?
Mense: “It’s always come pretty natural for Alejandro Kirk. He’s always been a very good decision-maker. And if you want to talk about somebody who is very laid-back, and very thoughtful, he’s your prototypical guy. Even at the lower levels of the minor leagues, he was always walking more than he struck out. He was always getting himself into good counts.
“We have a grading-out system of decision-makers in the organization, and Alejandro was always one of the better ones, even at the lowest levels. His success has come from hitting the ball harder and in the air a little bit more, but he’s always kind of had that innate ability. You don’t necessarily talk about it a whole lot when a guy is really good at it, but you do continue making sure they keep at it.”
Laurila: How does the grading system work?
Mense: “If you’re able to take a pitch that most people are swinging at, you grade out really well as a decision-maker. And then if you’re swinging at pitches that have an expected slugging percentage that’s really good, you’re going to get high grades. Spencer Horwitz is another one in our organization that’s always been a really good decision-maker. He swings at every pitch that’s in the area where the expected slugging percentage is really good, and he takes a lot of pitches that are strike-to-ball — pitches that 75-plus percent of people are swinging at, he’s able to take them.
“That’s how you ultimately grade out. It’s not necessarily just low chases and high in-zone swings, although that does play into it. But how tough is the pitch that you’re taking? It could be a really easy pitch, a ball out of the hand that everybody takes. Conversely, if it’s one that starts in the strike zone and goes out — maybe it’s from a pitcher with really good stuff — you’re probably a pretty good decision-maker.”
Good to hear about Horwitz. Just need to find him a position and he may be something far more useful. He also mentions that Orelvis has improved greatly in this regard so far this year.