Water Polo is a sport in which the rules and the technical and tactical fundamentals are progressively evolving. In recent years the use of video with analysis software has risen and the creation of these programs is believed to be necessary to analyze the internal structure of water polo. The main objective is to design and validate an ad hoc instrument that allows us to analyze technical-tactical actions in water polo. The instrument has been created from viewing the matches of the 2013 Barcelona World Swimming Championships where we studied 24 matches (12 female and 12 male) from the quarterfinals. Observational methodology was used being multidimensional, nomothetic and punctual. The criterion of authority was used for the validity of the content creating a survey with the response of 12 coaches and for reliability conducted using the Kappa Cohen intra-observational and inter - observational analysis test with IBM® SPSS® program Statistics version 21.0. It can be concluded that the designed instrument is valid and reliable and is a useful tool for Scouting.