Background: Performance assessment of soccer player skills is not a trivial task. Several and unpredictable factors and events that occur during a match determine the manner in which
a player decides and execute his actions. Instruments for skill performance assessment for soccer must take into account not only the ability of aplayer to execute technical skills but also how the
player displays his skills to dispute against the opponent in an environment in constant changes. The aim of the present study is to propose an instrument that assesses soccer technical skills in a
Methods:The instrument proposed in the present research is called Soccer Player Assessment Instrument (SPAI). The SPAI assesses soccer technical skills (passing for maintenance ball
possession, offensive passing, reception, dribbling and shooting to goal) according to difficulty index (DI). The DI expresses the level of difficulty that a soccer technical skill was executed during
the match. For instance, execution of a skill under pressure of an opponent represents a higher level of DI compared with no pressure of an opponent. Furthermore, if the skill is successfully executed
it will be given a higher value than if the skill is not successful.The content validation of the instrument was done by five soccer experts using Likert scale with 1 to 5 response scale (1=
inadequate, 2 = little adequate, 3 = acceptable, 4 = good, 5 = very good). For validity purpose, it was only considered valid content that received a score>3. Three undergraduate students were invited
to serve as examiners to estimate reliability of SPAI data. Inter-rater and test-retest reliability was estimated using Spearman’s correlation coefficient and weighted Kappa index. The examiners
analyzed approximately 2110 soccer technical skills in two matches.
Results: The comparison between the raters indicated strong Spearman’s correlation coefficient (values above .60) and Kappa index of agreement ranged from good (.61 to .80) to
excellent (.81 to 1.0) for soccer technical skills and DI. For test-retest reliability the results showed strong Spearman’s correlation coefficient (values above .60) and excellent Kappa index of
agreement (.81 to 1.0) for soccer technical skills and DI.
Conclusions: Although the use of SPAI is based upon human judgments that may be subjective, the results showed a good reliability. The SPAI was conceived to express the level in which
a player applies his technical skills to be successful in every action during a match.Such instrument appears to assess satisfactorily its purpose.