Rule 6.02(d)(1) applies to the batter and the time between pitches. The rule is intended to prevent the batter from stepping entirely out of the batter's box between pitches and slowing down or delaying the game. It is similar to a long-standing rule used in high school baseball intended to "speed up" the game. Rule 6.03 applies to the batter when he assumes his batting stance and is waiting for the pitcher to deliver the pitch. The batter must position himself (prior to the delivery of the pitch) so that both feet are entirely within the batter's box. He can have a foot on the line, but no part of his foot may extend outside the line when he first assumes his stance. This rule could appear to contradict Rule 6.06(a) which rules a batter out when he hits the pitch with one (or both) feet on the ground entirely outside the batter's box. Under rule 6.03, the batter must have both feet entirely within the batter's box (touching the line counts as being within the box). Under 6.06(a) the batter is out only if his foot is on the ground and entirely outside the batter's box. So Rule 6.06(a) allows the batter to hit the ball even if part of one or both feet are outside the box as long as some part of the foot is touching the lines of the batter's box.