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The aim of this study is to compare game principles performed by 18 youth soccer players taking into account the tactical principles of the game, the action's place and respective outcome. The sample comprised 763 tactical actions performed by soccer players from one Portuguese club. The test "GK3-3GK" was used to provide the evaluation of tacti- cal actions according to ten basic tactical principles of soccer game. For data analysis it was used a descriptive analysis and chi-square ( ) test (p 0.05). The results showed that players perform better the tactical actions related to the offen- sive principles than to the defensive principles. In conclusion, it is possible to assert that players have to improve, mainly, the performance of the "delay", "balance" and "defensive unity" principles. a field of 36 meters length and 27 meters width. With the exception of the offside rule, all official Soccer rules were applied. The test aimed to evaluate the tactic actions per- formed by players (with and without the ball) attending on ten fundamental tactical principles of the game. Addition- ally, the test considered the place of action and the action outcome. Based on this information several indexes of per- formance were calculated, concerning tactical game princi- ples, place of action and action outcome. Procedure

Tactical Behaviour in Soccer: Analysis of an Under-11 Team by the “GK3-3GK” Test