For instance, if you see a tee-ball batter take his stance then straighten his arms to full extension and hold the barrel of the bat to the ball for several seconds or as a repeated measure before swinging, this is a warning sign that the swing is long, looping, sweeping and is destined for inconsistent success when attempting to hit a pitched ball. The swing must be shortened.
Also, if a tee-ball batter assumes his stance, then makes an exaggerated loading movement backward (toward the catcher) as if he’s hitting a golf shot as a part of initiating his swing, this is a warning sign that his swing will be late and ill-timed when attempting to hit a pitched ball. The load must occur before the swing, as a precursor, not as a part of the swing.
The tee is an incredible and valuable resource that is often derided as being “too easy” or “only for beginners.” However, it is perhaps the only way to uncover and overcome these, and other, technique flaws. Use the tee as a complement to the pitched ball. Keep both in your repertoire for maximum success and like the actor Mr. T, pity the fool who abandons the tee!
From May 2011, http://raisingahitter.wordpress.com