data points

1. Arrows: Ball position at 15 feet.  For most people this is where the person is targeting. It is good to be able to consistently hit different targets all the way from 1 to 25. 
2. Breakpoint Board: Ball position at the furthest point away from the center of the lane. The desired position varies depending upon the lane condition, bowling ball and the bowler’s dynamics (speed and revs).
3. Breakpoint Distance:  The distance the ball was at the breakpoint. Much like the breakpoint board, this will vary largely based on the variables of condition, ball and player. 
4. Entry Board:  The ball position at 59.5 feet. The strikes percentage is highest when hitting the pocket between 16.5 and 17.5 but varies depending on the speed and angle of the bowling ball. 

5. Launch Speed:  The speed the ball is in the front part of the lane. Most professionals range between 17.5 and 21 mph with a range of less than .5 mph. It is also important that you can vary this speed to help match up to different lane conditions. 

6. RPM:  Rotations Per Minute:  A calculated number that calculates the revs of the player based on a number of factors. Environmental factors can change the number dramatically so it should only be used as a reference point during normal conditions.