A basketball shot determination system for use with a basket and a portable electronic device including a processing unit (P), a memory, (M) an output device and a data acquisition device , the system comprising: a basketball ; at least one sensor carried by the basketball ; a signal transmitter carried by the basketball ; a portable electronic device including a processing unit (P), a memory (M), an output device and a data acquisition device ; a non-transient computer-readable medium containing code to direct the processing unit (P) to: obtain at least one attribute of a shot of the basketball , the at least one attribute being sensed by the at least one sensor or derived from signal output by the at least one sensor; determine whether the shot is a made basket by comparing the at least one attribute of the shot to one or more predetermined signature characteristics of a made basket shot or a missed basket shot; and present output to a person based on the determination of whether the shot is a made basket shot or a missed basket shot, wherein the at least one signature characteristic of a made basket shot comprises a characteristic of the basketball sensed by the at least one sensor as the basketball passes through a net of the basket and the net exerts a resistance (R) against the gravitational force of the falling basketball wherein the portable electronic device is in communication with the at least one sensor carried by the basketball . a basketball ; at least one sensor carried by the basketball ; a signal transmitter carried by the basketball ; a portable electronic device including a processing unit (P), a memory (M), an output device and a data acquisition device ; a non-transient computer-readable medium containing code to direct the processing unit (P) to: obtain at least one attribute of a shot of the basketball , the at least one attribute being sensed by the at least one sensor or derived from signal output by the at least one sensor; determine whether the shot is a made basket by comparing the at least one attribute of the shot to one or more predetermined signature characteristics of a made basket shot or a missed basket shot; and present output to a person based on the determination of whether the shot is a made basket shot or a missed basket shot, wherein the at least one signature characteristic of a made basket shot comprises a characteristic of the basketball sensed by the at least one sensor as the basketball passes through a net of the basket and the net exerts a resistance (R) against the gravitational force of the falling basketball obtain at least one attribute of a shot of the basketball , the at least one attribute being sensed by the at least one sensor or derived from signal output by the at least one sensor; determine whether the shot is a made basket by comparing the at least one attribute of the shot to one or more predetermined signature characteristics of a made basket shot or a missed basket shot; and present output to a person based on the determination of whether the shot is a made basket shot or a missed basket shot, wherein the at least one signature characteristic of a made basket shot comprises a characteristic of the basketball sensed by the at least one sensor as the basketball passes through a net of the basket and the net exerts a resistance (R) against the gravitational force of the falling basketball wherein the portable electronic device is in communication with the at least one sensor carried by the basketball . <EOS>