Aim of this research is to analyse the appropriate age for beginning of learning tactical elements in water polo according to water polo experts` coaches` opinion. Accordingly, 27 expert water polo coaches completed a novel questionnaire, specifically designed for this study. Test-retest reliability indicated satisfactory scores (r ranged from 0.85 to 1.00 with p<0.05 for all variables). By using tree-joining cluster analysis, a dendrogram was obtained that shows the process of hierarchical formation of groups of tactical elements of the water polo game and the level at which the element joined the group in relation to its proximity. Therefore, hierarchical cluster analysis was used in order to obtain relatively homogeneous groups of elements of the tactical game of water polo according to the requirements of the experts' point of view. Two groups were established: the first group can be defined as Tactical activities in the form of static defences and less frequent attacks with an equal number of players whilst the second group can be defined as Tactical activities in the form of dynamic defences and usual attacking activities. The current results provide a better insight into the opinions of experts on learning water polo tactics and offer essential guidelines for all stakeholders in the training process of young water polo players.
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