Systems and methods are provided for processing an individual performance data model of a person, such as a student, performing a physical skill or task. The individual performance data model is derived from an elite or superior performance data model determined from a number of elite or superior performances of the skill or task. In particular, the elite or superior performance model is sized or scaled to the student's body dimensions to produce a customized individual performance data model of the student's ideal or superior performance of the skill. The individual performance data model is used in teaching processes to identify and correct the student's performance errors. Embodiments of the invention modify the individual performance data model of the student to incorporate significant body movement trends exhibited by elite or superior performers that are related to body segment size. Further embodiments of the invention modify the individual performance data model for evaluating and scoring the student's actual performance of the skill, and for evaluating and fitting equipment the student uses to perform the skill. In particular, embodiments of the invention seek to alleviate the technical problem of how to process video data streams captured of the student's actual performance of the skill to automate the identification of errors in the student's performance, to automate the corrective action the student must take to improve his/her performance and/or to avoid such errors, and to automatically assess the suitability and performance of equipment the student uses to perform the skill.