I'm not sure how it proves anything like that-anybody can be taught to take more walks at the expense of some of their hits. What San Diego is trying to do is instill plate discipline and make their hitters better, which I don't think this evidence has any proof for that at all. Edit: I do think plate discipline to a point is learned (some of it is natural, and some of it can be improved)-but this shows me very little except that they pushed their hitters to take more pitchers, which in a couple leagues caused high walks, high SO's, and very low AVG and SLG. That's not true at all. The high strike outs, low average, and slugging are independent of plate discipline. It shows how bad some of the players are in their system. Adam Dunn has high strikes, low average and great slugging. I can't agree with the bolded statement. While I in no way believe that lower AVG and SLG numbers are the result of their more patient approach at the plate (it probably has a lot to do with a lack of talent, by and large), they are definitely not independent of one another. They're all linked pretty closely as the result of a general approach at the plate. My only reply is that you can teach Ronny Cedeno to be more patient at the plate, yet he will never be able to slug like A-Rod. How do you account for the Adam Dunns and Mark Bellhorns of MLB? I'm not sure what you're asking. Adam Dunn's and Bellhorn's (or any ballplayer's) abilities are all the result of their approaches at the plate and their world class hand-eye coordination. Obviously, Ronny's slugging (or his patience or his overall hitting ability) will never be at ARod's level. That doesn't make SLG independent from OBP or from batting average or even strikeouts, and certainly not from the hitter's actual approach to batting. They're all intertwined (to varying degrees) and are all the result of what the hitter is doing up there at the plate. Dunn's numbers are a result of an incredibly powerful swing, a very patient approach at the plate (both of which could lead to strikeouts), and an assload of hitting talent. I'm not being clear. There are hitters who are patient but with no power and low batting average (Bellhorne, Hattiberg, C. Guillen) There are hitters who are patient with lots of power and low batting average (Dunn, Burrell, Youklis) There are hitters who are patient with lots of pwer and high batting averges. (Pujols, Bonds, Howard) There are hitters with little patience, no power and low batting average (Neifi, Izturis) (but not many) There are hitters with little patience lots of power and low batting average (Kingman, Soriano, Monroe, Francouer) There are hitters with little patience lots of power and high batting averag (Vlad, Aramis, LaRoche) What I am saying is that SLG and AVE are independent of patience. The best players combine all three and that's why we call them the best. Having patience at the plate does not automatically make a player a better hitter.