<bold>Background:</bold> 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.
<bold>Material/Methods:</bold> 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.
<bold>Results:</bold> 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.
<bold>Conclusions:</bold> 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.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.