Keith Law: Command and control are often mentioned together, like Bert and Ernie or chocolate and peanut butter, but they aren’t the same thing. Control is simpler to define and identify, while command is nebulous and evaluating it is more subjective. Control is the ability to throw strikes, period. It says nothing about good strikes, and has little to do with intent — it’s a pitcher’s skill at executing a binary variable, strike or not-strike, across all pitches.
Command is a bigger thing, harder to define and much harder to evaluate. Command is a matter of a pitcher throwing the ball where he wants to throw it and how he wants to throw it. It’s about hitting a spot versus hitting the zone. And it’s far more likely for a pitcher to have differing levels of command across his pitches than to have differing levels of control; many teams’ scouting reports separate fastball command from command of other pitches. I tie command to a pitcher’s ability to repeat his delivery, because that kind of repetition, especially when it comes to a release point, is a major input into whether the pitcher can put the ball where he wants it and make it move (or not move) as he desires.