The data presented in this study define the quantitative evaluation of the indicator „security” in the playing technique for the discipline „Women-single”. The forced and unforced errors made by 5 Bulgarian badminton players during matches of state championships were determined. The data were recorded for 15 game indicators (strokes), divided into three groups: „attacking”, „neutral”, „defensive” and the elements „service”, „receiving”. For the set goal and tasks the following methods were applied: the research - study of specialized information sources; method of direct and indirect observation (recording-registration of game activity). The following mathematical-statistical methods were applied: analysis of variance, alternative analysis. The effect of the applied author's methodology on the improvement of attacking style of play, in particular - minimization of unforced errors by the female athletes studied in a pilot study was investigated. The results revealed a decrease in errors made in the „attacking” group from 40% to 32% at the end of the study; in the group of „neutral” strokes the female athletes made approximately the same percentage of errors: 27% and 28% in the second observation. The percentage of recorded inaccuracies for the „defensive” strokes group increased, from 33% in the initial data to 40% in the final measurement. The report reveals in detail the dynamics of the indicator „security” in the technique of the basic strokes in badminton, distributed by groups for the discipline „Women – single”, the results are of practical value for the work of sports educators