An Observation Instrument for Technical and Tactical Actions in the Soccer Offense Phase: Design, Validation, and Reliability

Coaches and other sports professionals are given adaptable tools by using observational methods in the context of sports. These tools are frequently used in team sports for technical and tactical analysis of the match. The goal was to build, validate, and evaluate the dependability of a mixed observational instrument of field formats and category systems to study technical and tactical activities in the offensive phase of soccer, taking into account the significance of data quality in these instruments. The device records data on the attacking team’s and goalkeeper’s actions with the ball, play moments (start, development, and end), and surrounding circumstances. Four steps were taken in the instrument design, validation, and reliability calculation: (a) literature review; (b) initial draft design; (c) qualitative and quantitative expert assessment of the instrument; and (d) observer training test (reliability calculation). Ten experts (soccer coaches with at least ten years of coaching experience or sports scientists with a PhD) determined the content validity. The Delphi process was applied. A quantitative (scale 0 10) and qualitative examination was performed by experts. The following topics were covered in the questionnaire for experts: (a) understanding of the criteria, categorical cores, degree of openness, and their definitions; (b) applicability of the categorical cores and degree of openness; and (c) decision-making on the inclusion of further categorical cores or degree of openness in the observation instrument. The categorical core “numerical situation with opponent goalkeeper” has the lowest Aiken’s V index of 0.91. The levels of agreement between and among observers were good. The category core “defensive pressing lines” had the lowest Kappa index (0.96 for inter-reliability and 0.98 for intra-reliability), as did the category core “ball height (start of ball possession),” “distance of the defensive player,” “ball height (end of ball possession”),” “numerical situation,” and “defensive pressing lines.” The generalizability analysis’ results demonstrated the instrument’s excellent level of accuracy, validity, and reliability. The findings demonstrate that the tool can be used to gather unbiased, trustworthy information regarding soccer’s offensive phase.