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This paper describes the measurement and analysis of a player's motion while making a jump shot in basketball. In order to increase the probability of a shot going into the basket, a player must develop good shooting form. We find the features of the motion that leads to a good jump shot using a simple sensoring device that combines a 3-D acceleration sensor and a gyroscopic sensor. Players practiced jump shots with the device mounted on the back of their hand to help them correct the errors in their shooting through sound feedback based on these features. The results of the experiments show that the device can improve a player's shooting form.