There are some subjective things that would be difficult to measure - Situational batting calls (bunts, 3-0 green lights, etc..) - Contact plays when on 3rd base - General coaching / Interpersonal type stuff. But if you limit it to baserunning decisions (which is mainly the complaint that I hear about Sedar), I think you can quantify it. The biggest problem would be sample size, but I don't think the other variables are that hard to control. - Define close plays at the plate - Perhaps this is anytime a player going to the plate has the ball thrown to the catcher - Count only instances where the runner didn't originate at 3B (i.e. where the coach actually sent him home). Then tally the percentage of success. Again, small sample sizes will be your enemy, but at some point it becomes large enough to negate the luck aspect. As I posted above, compare that success rate to the chances of scoring from 3rd based on the situation (# of outs). Ideally, you are aggressive enough to approach the same success rate of scoring from 3rd, but not below it.