Shared Mental Models (SMM) are defined as knowledge structures held by each team member, enabling them to form accurate explanations and expectations of each other and adapt their own behavior (Cannon-Bowers et al., 1993). So far, measurements captured SMMusing statical questionnaires (e.g. Filho et al., 2014). However, measurements shoud incorporate the dynamic sport-context. The aim of the study is to develop an ecological valid, video-based measurement for SMM in tennis doubles. In total, 35 tennis doubles clips and two conditions were selected. In Condition Self participants respond for themselves. In Condition Partner they indicate their partners response. Measured was ball taking response, expertise, time played together and perceived trustworthiness (9 items). In total, 29 male tennis teams were analyzed, being 34.57Mean years old (SD=12.25) and had 22.79Mean years (SD=10.49) tennis experience. Inter-player agreement -Self/Partner-was analyzed for each partner and averaged per team (SMM). The resultsshow that SMM depend on the difficulty level of the videos, F(2,.15)=8.77,p<.01,np2=.24. Post hoc analysis show that SMM are higher on easy than on medium (d=0.58) and hard videos (d=0.94). The average agreement of Partner 1 and Partner 2 show a significant correlation (r =.63, p<.001). However, no significant correlations to expertise, time played together or trustworthiness were found. The results indicate that measuring SMM using video-based measurement is possible, due to the diverse video difficulty. Furthermore, a relationship between SMMs of partners can be found. The results underline that developing an ecological measurement of SMM using dynamic sport-related material is promising.
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