Background: The aim of this study was to develop a research tool used to assess the efficiency a goalkeeper's actions in a game of futsal. Material/Methods: Author's own proposal of an observation sheet was created and subject to a validation procedure. To assess intra-rater reliability and inter-rater reliability, the ICC test was used. Results: There was a strong compatibility of ratings of the intra-rater reliability - 1.00 (95% Cl 1.00-1.00) and the inter-rater reliability − 0.99 (95% CI 0.99-1.00), which proves the reliability of the proposed research tool. Conclusions: The developed sheet allows the registration and evaluation of individual performance and cooperation in terms of goalkeeper's game objectives pursued both in offence and defence.
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