Pitching charts are overlooked in youth baseball. Many coaches simply don't understand their proper use. The fact is that pitching charts on the youth level are entirely different in purpose and function than from the professional level... Your charts should count pitches, spot location, and identify what type of pitch was thrown to what batter in the lineup.
For example, you should be concerned when the pitch count is up around 90. You will need to know if the pitcher is throwing down the middle too much or throwing curveballs to the number-nine hitter. Your charts will show this, and a meeting to review these charts with the pitcher should follow every game.
Excerpts from Ch. 4, pg. 93