The aim of this research was to identify the factors responsible for the types and quantities of the load of water polo players in situational conditions of the game, to carry out a description of the water polo play in the space of the implemented indicators (parameters) of the load for the whole sample as well as groups specified by their role in the play. Also the aim was to settle and analyze the differences between four different roles in the game and to accomplish the differentiation of the roles in the play in the space of the registered, constructed and saved-forfinal-analysis indicators relating to the number of actions, the levels of the load and the quantities of motions in the horizontal and vertical phases of the game. Various types and quantities of movements, at various intensities, durations and frequencies, in the horizontal and vertical phases of the play were registered on the sample of 91 water polo players in different roles in the game, by means of notification method at the official games of the Adriatic Water Polo League. For this purpose the statistics of all implemented indicators was calculated, Analysis of variance (ANOVA) was performed and statistical significance between pairs for all positions was established by Post Hoc analysis according to Scheffé. Canonical discriminative analysis was implemented in the manifest space of indicators. For the purposes of identification of the latent structure the inter correlations matrix of all indicators was calculated. Standard factor analysis under the component model was performed where the final factor solution was given by Oblimin rotation. Canonical discriminative analysis in the latent space was implemented, which finally resulted in discriminative classification. In the manifest indicators space two statistically significant discriminative functions were assigned. The first describes over maximal load of the players expressed by frequencies and the time spent in duels in the vertical phase of the game, which are inversely proportional with the total time spent in the game as well as frequencies and meters swum in back stroke, crawl technique in maximal intensity and breast stroke technique in light intensity in the horizontal phase of the game. The second describes frequencies and the time spent with an unequal number of players, therefore, about maximal load in the vertical phase of the game and with contrary directed algebraic sign frequencies as well as meters swum in back stroke technique, which defines light work intensity in the horizontal phase of the game. The results of canonical discriminative analysis show that the four positions are reduced to three. There is a statistically significant difference between the wing and the external attacker as well as between these two and the center forward and the guard, who in turn statistically significantly differ between themselves. Six factors were obtained in the latent space. Regression scores of all players on the factors were calculated and the implemented tests of arithmetic means equality showed that the differences on the scores were statistically significant on the first, third, fourth, fifth and sixth factors. In the canonical discriminative analysis of the latent space one statistically significant discriminative function was obtained. Discriminative function and centroids of groups showed the evident differences between centers forward and guards in relation to wings and external attackers. Wings and external attackers mutually differ very little, while they statistically significantly differ from centers forward and guards, who in turn statistically significantly differ between themselves. Over maximal load in the vertical phase of the game (duels, number and duration) defines guards and centers forward while the sub maximal and maximal intensities of crawl swimming in the horizontal phase define wings and external attackers. The final results of the canonical discriminative analysis of the latent space resulted in discriminative classification with clearly recognized centers forward, somewhat less distinctly recognized wings and external attackers and very poorly recognized guards. The results of this investigation resulted in the Model of mutual relationships of the load of water polo players in situational conditions of the game based on the chosen indicators of the load.