The science of skills is a very practical lecture about the use of technology, statistics and science in a high performance surrounding. Using technology in order to be able to give direct feedback to coaches to make a connection between the experienced performance by an athlete in relation to the real outcome of a start or a turn is necessary to enhance performance. The lack of ‘hard’ data and exact times often lead to wrong conclusions and guesses by coaches in the training process. Software, hardware, mathematics and research has to be focused on individual oriented performance monitoring. In this lecture I would like to share our findings and lessons learned in the past years.